How this year’s Nobel winners changed the thinking on economic growth

Source: The Conversation – UK – By Antonio Navas, Senior Lecturer in Economics, University of Sheffield

The prizewinners were announced at a ceremony in Stockholm. EPA/ANDERS WIKLUND SWEDEN OUT

What makes some countries rich and others poor? Is there any action a country can take to improve living standards for its citizens? Economists have wondered about this for centuries. If the answer to the second question is yes, then the impact on people’s lives could be staggering.

This year’s Sveriges Riksbank Prize in Economic Sciences (commonly known as the Nobel prize for economics) has gone to three researchers who have provided answers to these questions: Philippe Aghion, Peter Howitt and Joel Mokyr.

For most of human history, economic stagnation has been the norm – modern economic growth is very recent from a historical point of view. This year’s winners have been honoured for their contributions towards explaining how to achieve sustained economic growth.

At the beginning of the 1980s, theories around economic growth were largely dominated by the works of American economist Robert Solow. An important conclusion emerged: in the long-run, per-capita income growth is determined by technological progress.

Solow’s framework, however, did not explain how technology accumulates over time, nor the role of institutions and policies in boosting it. As such, the theory can neither explain why countries grow differently for sustained periods nor what kind of policies could help a country improve its long-run growth performance.

It’s possible to argue that technological innovation comes from the work of scientists, who are motivated less by money than the rest of society might be. As such, there would be little that countries could do to intervene – technological innovations would be the result of the scientists’ own interests and motivations.

But that thinking changed with the emergence of endogenous growth theory, which aims to explain which forces drive innovation. This includes the works of Paul Romer, Nobel prizewinner in 2018, as well as this year’s winners Aghion and Howitt.

These three authors advocate for theories in which technological progress ultimately derives from firms trying to create new products (Romer) or improve the quality of existing products (Aghion and Howitt). For firms to try to break new ground, they need to have the right incentives.

Creative destruction

While Romer recognises the importance of intellectual property rights to reward firms financially for creating new products, the framework of Aghion and Howitt outlines the importance of something known as “creative destruction”.

This is where innovation results from a battle between firms trying to get the best-quality products to meet consumer needs. In their framework, a new innovation means the displacement of an existing one.

In their basic model, protecting intellectual property is important in order to reward firms for innovating. But at the same time, innovations do not come from leaders but from new entrants to the industry. Incumbents do not have the same incentive to innovate because it will not improve their position in the sector. Consequently, too much protection generates barriers to entry and may slow growth.

But what is less explored in their work is the idea that each innovation brings winners (consumers and innovative firms) and losers (firms and workers under the old, displaced technology). These tensions could shape a country’s destiny in terms of growth – as other works have pointed out, the owners of the old technology may try to block innovation.

This is where Mokyr complements these works perfectly by providing a historical context. Mokyr’s work focuses on the origins of the Industrial Revolution and also the history of technological progress from ancient times until today.

Mokyr noted that while scientific discoveries were behind technological progress, a scientific discovery was not a guarantee of technological advances.

It was only when the modern world started to apply the knowledge discovered by scientists to problems that would improve people’s lives that humans saw sustained growth. In Mokyr’s book The Gifts of Athena, he argues that the Enlightenment was behind the change in scientists’ motivations.

illustrated headshots of the 2025 nobel prizewinners in economics.
The 2025 winners Joel Mokyr, Philippe Aghion and Peter Howitt.
Ill. Niklas Elmehed © Nobel Prize Outreach

In Mokyr’s works, for growth to be sustained it is vital that knowledge flows and accumulates. This was the spirit embedded in the Industrial Revolution and it’s what fostered the creation of the institution I am working in – the University of Sheffield, which enjoyed financial support from the steel industry in the 19th century.

Mokyr’s later works emphasise the key role of a culture of knowledge in order for growth to improve living standards. As such, openness to new ideas becomes crucial.

Similarly, Aghion and Howitt’s framework has become a standard tool in economics. It has been used to explore many important questions for human wellbeing: the relationship between competition and innovation, unemployment and growth, growth and income inequality, and globalisation, among many other topics.

Analysis using their framework still has an impact on our lives today. It is present in policy debates around big data, artificial intelligence and green innovation. And Mokyr’s analysis of how knowledge accumulates poses a central question around what countries can do to encourage an innovation ecosystem and improve the lives of their citizens.

But this year’s prize is also a warning about the consequences of damaging the engines of growth. Scientists collaborating with firms to advance living standards is the ultimate elixir for growth. Undermining science, globalisation and competition might not be the right recipe.

The Conversation

Antonio Navas does not work for, consult, own shares in or receive funding from any company or organisation that would benefit from this article, and has disclosed no relevant affiliations beyond their academic appointment.

ref. How this year’s Nobel winners changed the thinking on economic growth – https://theconversation.com/how-this-years-nobel-winners-changed-the-thinking-on-economic-growth-267455

Is the end looming for Canada’s border pre-clearance program with the United States?

Source: The Conversation – Canada – By Emily Gilbert, Professor, Canadian Sudies and Geography & Planning, University of Toronto

At a testy meeting in Banff recently, the American ambassador to Canada, Pete Hoekstra, mused about the future of pre-clearance in Canada. Cross-border travel numbers are down, he complained, which makes the cost of the program less appealing to Americans.

Hoekstra’s comments came across as a threat — almost a demand that Canadians resume travelling to the United States.

But should Canadians continue to stay away? Maybe it’s time to rethink Canada’s pre-clearance program with the U.S. and the ways it can undermine Canadian civil rights and sovereignty.

Started informally, then expanded

The origins of U.S. customs pre-clearance in Canada date back to 1952. It began as an informal arrangement made at the request of American Airlines, which was interested in building up its business in Canada.

Since then, the program has expanded to nine Canadian international airports and the Alaska Marine Highway System Ferry Terminal in Prince Rupert, B.C. The U.S. has also expanded its pre-clearance facilities to the Bahamas, Bermuda, Ireland and the United Arab Emirates.

Under Canada-U.S. pre-clearance arrangement, American border agents are located in Canada so that travellers can clear customs, immigration, public health and safety and agriculture inspection before they travel. This provides an additional layer of security for the U.S. since it can screen travellers much earlier in their travel journeys and stop suspicious travellers before they board their flights.

For Canadian travellers, it makes crossing the border faster. By clearing customs in Canada, they don’t need to wait in long lines when they arrive in the U.S. This makes it much easier to catch connecting flights and also means airlines can fly into smaller American airports from Canada, which can be cheaper and more convenient.

Police powers

Pre-clearance in Canada has become so commonplace that it’s not faced significant scrutiny, even though recent legislation raises pressing concerns.

In 2015, the U.S. and Canada signed a new treaty on land, rail, marine and air transport pre-clearance. This legislation opened the door to expanded pre-clearance with new facilities at Québec City’s airport and Billy Bishop airport on the Toronto islands, scheduled to open soon. Pilot projects have also been introduced at train stations and ports, which raise their own issues because they’re often located in city centres.

Subsequently, Canada passed its new Preclearance Act that entered into force in 2019. The legislation updated the terms for pre-clearance but also introduced worrisome and expansive new police powers for U.S. officers on Canadian soil.

American border agents now have the power to conduct strip searches if a Canadian officer is not available or is unwilling to participate. American border agents also have the authority to carry weapons.

Under the previous legislation of 1999, U.S. border agents were authorized to use “as much force is necessary to perform their pre-clearance duties” if they did so “on reasonable grounds.” But under the recent legislation, U.S. officers are “justified in doing what they are required or authorized to do under this Act and in using as much force as is necessary for that purpose.” In other words, the use of force is now legitimized.

Furthermore, while it was previously possible for travellers to remove themselves from inspection without prejudice, under the 2017 legislation, their withdrawal from the border process could be interpreted as grounds for suspicion.

The act of withdrawal itself becomes suspect, with refusal to answer taken as obstruction, which is a criminal offence in both the U.S. and Canada. This can impede someone’s ability to enter the U.S. at a later date.

If someone is suspected of committing an offence, U.S. border agents are also able to detain them as long it does not “unreasonably delay the traveller’s withdrawal” from the process. There is no time limit placed on what is meant by “unreasonably delay.”

Worrisome legislative changes

When the new Preclearance Act was introduced, Prime Minister Justin Trudeau tried to assuage concerns by explaining that pre-clearance allowed more protections for travellers because the Canadian Constitution would apply in Canada.

The act itself states:

“The exercise of any power and performance of any duty or function under United States law in Canada is subject to Canadian law, including the Canadian Charter of Rights and Freedoms, the Canadian Bill of Rights and the Canadian Human Rights Act.”

But can these protections really be assured when there are overlapping jurisdictions at play?

Take U.S. President Donald Trump’s most recent 2025 travel ban that fully bans nationals of 12 countries and partially bans nationals of seven others.

As Amnesty International argues, Trump’s bans are “targeting people based on their race, religion, or nationality, from countries with predominantly Black, Brown and Muslim-majority populations.” Yet these bans are being enforced in Canada via these pre-clearance areas, meaning the rights and protections against discrimination set out in Canadian laws are not being upheld.

Under the terms of the 2015 treaty, pre-clearance officers also receive immunity for civil and administrative offences in their host countries. Furthermore, the U.S. passed legislation a year later stipulating the U.S. has jurisdiction over offences committed by American personnel stationed in Canada.

As Canada’s privacy officer has stated, this lack of accountability in Canada means there is little recourse for someone in Canada who experiences an incident with American border officers when going through pre-clearance. If there is no accountability, then Canadian laws are essentially meaningless.

Border politics

For these reasons, a Canadian reassessment of the pre-clearance program is all the more pressing since efforts are already underway to implement Canadian pre-clearance at land borders with the U.S.

In January 2025, before Trump’s inauguration, a two-year pilot project was announced at the Cannon Corners facility on the New York-Québec border. This would be somewhat different from the police powers granted to American border officials at Canadian airports, but Canada’s objectives have been similar to U.S. security directives — make admissibility determinations before someone enters Canada.

In other words, Canada is proceeding with pre-clearance initiatives that make it more difficult for people to make asylum claims when crossing the Canada-U.S. border.

Hoekstra has put the future of pre-clearance in question. This provides an excellent opportunity to reconsider whether the costs of the program outweigh the benefits in today’s political climate. That’s because no matter how convenient and efficient pre-clearance programs might be, they raise challenging questions about Canadian sovereignty and the rights of Canadian citizens.

The question should really be whether Canada wants to pursue America-style border politics rather than trying to build more humane border policies and practices.

The Conversation

Emily Gilbert has received funding from the Social Sciences and Humanities Research Council.

ref. Is the end looming for Canada’s border pre-clearance program with the United States? – https://theconversation.com/is-the-end-looming-for-canadas-border-pre-clearance-program-with-the-united-states-266764

What the First Amendment doesn’t protect when it comes to professors speaking out on politics

Source: The Conversation – USA (2) – By Neal H. Hutchens, University Research Professor of Education, University of Kentucky

Employees at public and private colleges do not have the same First Amendment rights. dane_mark/Royalty-free

American colleges and universities are increasingly firing or punishing professors and other employees for what they say, whether it’s on social media or in the classroom.

After the Sept. 10, 2025, killing of conservative activist Charlie Kirk, several universities, including Iowa State University, Clemson University, Ball State University and others, fired or suspended employees for making negative online comments about Kirk.

Some of these dismissed professors compared Kirk to a Nazi, described his views as hateful, or said there was no reason to be sorry about his death.

Some professors are now suing their employers for taking disciplinary action against them, claiming they are violating their First Amendment rights.

In one case, the University of South Dakota fired Phillip Michael Cook, a tenured art professor, after he posted on Facebook in September that Kirk was a “hate spreading Nazi.” Cook, who took down his post within a few hours and apologized for it, then sued the school, saying it was violating his First Amendment rights.

A federal judge stated in a Sept. 23 preliminary order that the First Amendment likely protected what Cook posted. The judge ordered the University of South Dakota to reinstate Cook, and the university announced on Oct. 4 that it would reverse Cook’s firing.

Cook’s lawsuit, as well as other lawsuits filed by dismissed professors, is testing how much legal authority colleges have over their employees’ speech – both when they are on the job and when they are not.

For decades, American colleges and universities have traditionally encouraged free speech and open debate as a core part of their academic mission.

As scholars who study college free speech and academic freedom, we recognize that these events raise an important question: When, if ever, can a college legally discipline an employee for what they say?

A university campus with various buildings and trees is seen from above.
An aerial view of University of South Dakota’s Vermillion campus, one of the places where a professor was recently fired for posting comments about Charlie Kirk, a decision that was later reversed.
anup khanal – CC BY-SA 4.0

Limits of public employees’ speech rights

The First Amendment limits the government’s power to censor people’s free speech. People in the United States can, for instance, join protests, criticize the government and say things that others find offensive.

But the First Amendment only applies to the government – which includes public colleges and universities – and not private institutions or companies, including private colleges and universities.

This means private colleges typically have wide authority to discipline employees for their speech.

In contrast, public colleges are considered part of the government. The First Amendment limits the legal authority they have over their employees’ speech. This is especially true when an employee is speaking as a private citizen – such as participating in a political rally outside of work hours, for example.

The Supreme Court ruled in a landmark 1968 case that public employees’ speech rights as private citizens can extend to criticizing their employer, like if they write a letter critical of their employer to a newspaper.

The Supreme Court also ruled in 2006 that
the First Amendment does not protect public employees from being disciplined by their employers when they say or write something as part of their official job duties.

Even when a public college employee is speaking outside of their job duties as a private citizen, they might not be guaranteed First Amendment protection. To reach this legal threshold, what they say must be about something of importance to the public, or what courts call a “matter of public concern.”

Talking or writing about news, politics or social matters – Kirk’s murder – often meets the legal test for when speech is about a matter of public concern.

In contrast, courts have ruled that personal workplace complaints or gossip typically does not guarantee freedom of speech protection.

And in some cases, even when a public employee speaks as a private citizen on a topic that a court considers a matter of public concern, their speech may still be unprotected.

A public employer can still convince a court that its reasons for prohibiting an employee’s speech – like preventing conflict among co-workers – are important enough to deny this employee First Amendment protection.

Lawsuits brought by the employees of public colleges and universities who have been fired for their comments about Kirk may likely be decided based on whether what they said or wrote amounts to a matter of public concern. Another important factor is whether a court is convinced that an employee’s speech about Kirk was serious enough to disrupt a college’s operations, thus justifying the employee’s firing.

Academic freedom and professors’ speech

There are also questions over whether professors at public universities, in particular, can cite other legal rights to protect their speech.

Academic freedom refers to a faculty member’s rights connected to their teaching and research expertise.

At both private and public colleges, professors’ work contracts – like the ones typically signed after receiving tenure – potentially provide legal protections for faculty speech connected to academic freedom, such as in the classroom.

However, the First Amendment does not apply to how a private college regulates its professors’ speech or academic freedom.

Professors at public colleges have at least the same First Amendment free speech rights as their fellow employees, like when speaking in a private citizen capacity.

Additionally, the First Amendment might protect a public college professor’s work-related speech when academic freedom concerns arise, like in their teaching and research.

In 2006, the Supreme Court left open the question of whether the First Amendment covers academic freedom, in a case where it found the First Amendment did not cover what public employees say when carrying out their official work.

Since then, the Supreme Court has not dealt with this complicated issue. And lower federal courts have reached conflicting decisions about First Amendment protection for public college professors’ speech in their teaching and research.

A large gray stone plaque shows the First Amendment in front of a green grassy field and buildings in the distance.
The First Amendment is on display in front of Independence Hall in Philadelphia.
StephanieCraig/iStock via Getty Images Plus

Future of free speech for university employees

Some colleges, especially public ones, are testing the legal limits of their authority over their employees’ speech.

These incidents demonstrate a culture of extreme political polarization in higher education.

Beyond legal questions, colleges are also grappling with how to define their commitments to free speech and academic freedom.

In particular, we believe campus leaders should consider the purpose of higher education. Even if legally permitted, restricting employees’ speech could run counter to colleges’ traditional role as places for the open exchange of ideas.

The Conversation

The authors do not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and have disclosed no relevant affiliations beyond their academic appointment.

ref. What the First Amendment doesn’t protect when it comes to professors speaking out on politics – https://theconversation.com/what-the-first-amendment-doesnt-protect-when-it-comes-to-professors-speaking-out-on-politics-266128

Canada’s rising poverty and food insecurity have deep structural origins

Source: The Conversation – Canada – By Tracy Smith-Carrier, Professor and Canada Research Chair (Tier 2) in Advancing the UN Sustainable Development Goals, Royal Roads University

With one-quarter of Canadians struggling to put food on the table, Canada has recently received a D grade from Food Banks Canada for its performance in meeting the country’s food security needs.

According to a 2024 report by the federal government’s National Advisory Council on Poverty, poverty is also on the rise, and people who once thought they were financially secure are starting to feel the squeeze.

Canada is a signatory to the International Covenant on Economic, Social and Cultural Rights, recognizing the right to food, housing and an adequate standard of living.

As a social scientist, my research shows that Canada is struggling to realize these rights because decision-makers often lack the political will to act, and the judicial system still relies on an outdated approach that cannot hold these decision-makers accountable.

Understanding the rights split

Human rights are indivisible, meaning they’re all equally important and interdependent: one right cannot be realized without realizing the others. To meet their commitments, signatory states have agreed to respect, protect and fulfil human rights and to use the “maximum available resources” at their disposal to progressively achieve them.

While Canada and other United Nations member states have endorsed social and economic rights, these rights have often been treated differently from their civil and political counterparts.

Civil and political rights are typically considered negative rights, which do not require the government to act or provide anything, but rather to protect or not interfere with people’s rights, such as freedom of expression or religion. Social and economic rights, on the other hand, have often been deemed positive rights, meaning they require the state to act or provide resources to meet them, like education or health care.

In 1966, human rights were split: civil and political rights were placed under one covenant, and economic, social and cultural rights under another, rather than having them all affirmed under one, as was originally envisaged in the Universal Declaration of Human Rights in 1948.

Weaker language was deliberately included in the International Covenant of Economic, Social and Cultural Rights by the rights architects, particularly those in the United States, who felt that its ratification should not encroach on state autonomy or require “thicker social programs and a robust welfare state.”

Consequently, the courts, particularly Canadian lower courts and others internationally, have over the years commonly affirmed that social and economic rights are policy matters best determined by political entities and given democratic legitimacy at the ballot box.

While there is overlap between the two sets of rights, social and economic rights have frequently been deemed non-justiciable — not something people can challenge in court — and therefore not ones people can directly claim or pursue legal remedies for. Instead these rights have taken on an aspirational quality.

When courts are reluctant

Gosselin v. Québec set an important precedent for how social and economic rights would come to be interpreted in Canada.

This case relates to a regulation in the 1980s that set Québec’s social assistance benefits for people under 30 at only two-thirds of the regular benefit ($170 rather than $466 per month). The plaintiff claimed that the regulation was age-discriminatory and violated the Québec and Canadian Charters of Rights and Freedoms under Sections 7 and 15.

Judges in Québec, and later in 2002 in the Supreme Court — although the justices were split on the decision — confirmed the Charter did not impose positive-rights duties on governments, even while the Supreme Court left the door open that it could do so in the future.

Yet some legal scholars contend that the case took constitutional law “two steps backward” and failed to debunk the prejudicial stereotypes surrounding people living in poverty that influenced the decision. In 1992, a Québec Superior Court judge said “the poor were poor for intrinsic reasons” — that they were under-educated and had a weak work ethic.

Such reasoning, however, reflects an individual explanation of poverty — that financial hardship derives from personal failings or deficits — rather than a structural one, where poverty stems from economic downturns, weak labour markets and a lack of affordable child care or housing.

A significant body of evidence now shows that poverty largely has structural origins. Although there have been some victories on social and economic rights, many cases have followed the interpretation in Gosselin.

The right to housing was explicitly identified in the 2019 National Housing Strategy Act. The act introduced the National Housing Council and a complaints and monitoring mechanism through the federal housing advocate, a model that limits people from demanding state-provided housing and suing if they don’t receive it.

Lacking an ecosystem of rights compliance and enforcement, governments have turned to less effective options like charity, rather than engaging solutions that could actually end poverty and hunger, such as a basic income guarantee.

The impasse on social and economic rights has led to the denial of these rights for those living in poverty.

Enforcing implemented rights

Some, like Oxford legal scholar Sandra Fredman, argue the courts should use legal frameworks not to defer to politicians or usurp their decision-making capacity, but to require them to provide reasoned justifications for their distributive decisions.

Although non-binding, the UN’s judicial body, the International Court of Justice, recently concluded that countries have legal obligations to curb their emissions. Some courts, domestically and globally, are also gravitating toward the enforcement and justiciability of human rights, particularly in climate-related cases and the right to a healthy environment.

These could provide new precedents that transform how these rights are understood and enforced in the future.

Without concrete resources, targets and accountability mechanisms to ensure people have dignified access to food, housing and social security, these rights will remain largely hollow.

The “climate of the era” has changed. It’s time for politicians to actively work to fulfill social and economic rights and for the courts to hold them accountable when they fail to do so.

Without substantive rights — ones backed by action — poverty will continue to rise and people will be denied justice.

The Conversation

Tracy Smith-Carrier receives funding from the Tri-agency’s Canada Research Chairs program and the Social Sciences and Humanities Research Council.

ref. Canada’s rising poverty and food insecurity have deep structural origins – https://theconversation.com/canadas-rising-poverty-and-food-insecurity-have-deep-structural-origins-265570

What are climate tipping points? They sound scary, especially for ice sheets and oceans, but there’s still room for optimism

Source: The Conversation – USA (2) – By Alexandra A Phillips, Assistant Teaching Professor in Environmental Communication, University of California, Santa Barbara

Meltwater runs across the Greenland ice sheet in rivers. The ice sheet is already losing mass and could soon reach a tipping point. Maria-José Viñas/NASA

As the planet warms, it risks crossing catastrophic tipping points: thresholds where Earth systems, such as ice sheets and rain forests, change irreversibly over human lifetimes.

Scientists have long warned that if global temperatures warmed more than 1.5 degrees Celsius (2.7 Fahrenheit) compared with before the Industrial Revolution, and stayed high, they would increase the risk of passing multiple tipping points. For each of these elements, like the Amazon rain forest or the Greenland ice sheet, hotter temperatures lead to melting ice or drier forests that leave the system more vulnerable to further changes.

Worse, these systems can interact. Freshwater melting from the Greenland ice sheet can weaken ocean currents in the North Atlantic, disrupting air and ocean temperature patterns and marine food chains.

World map showing locations for potential tipping points.
Pink circles show the systems closest to tipping points. Some would have regional effects, such as loss of coral reefs. Others are global, such as the beginning of the collapse of the Greenland ice sheet.
Global Tipping Points Report, CC BY-ND

With these warnings in mind, 194 countries a decade ago set 1.5 C as a goal they would try not to cross. Yet in 2024, the planet temporarily breached that threshold.

The term “tipping point” is often used to illustrate these problems, but apocalyptic messages can leave people feeling helpless, wondering if it’s pointless to slam the brakes. As a geoscientist who has studied the ocean and climate for over a decade and recently spent a year on Capitol Hill working on bipartisan climate policy, I still see room for optimism.

It helps to understand what a tipping point is – and what’s known about when each might be reached.

Tipping points are not precise

A tipping point is a metaphor for runaway change. Small changes can push a system out of balance. Once past a threshold, the changes reinforce themselves, amplifying until the system transforms into something new.

Almost as soon as “tipping points” entered the climate science lexicon — following Malcolm Gladwell’s 2000 book, “The Tipping Point: How Little Things Can Make a Big Difference” — scientists warned the public not to confuse global warming policy benchmarks with precise thresholds.

A tall glacier front seen from above shows huge chunks of ice calving off into Disko Bay.
The Greenland ice sheet, which is 1.9 miles (3 kilometers) thick at its thickest point, has been losing mass for several years as temperatures rise and more of its ice is lost to the ocean. A tipping point would mean runaway ice loss, with the potential to eventually raise sea level 24 feet (7.4 meters) and shut down a crucial ocean circulation.
Sean Gallup/Getty Images

The scientific reality of tipping points is more complicated than crossing a temperature line. Instead, different elements in the climate system have risks of tipping that increase with each fraction of a degree of warming.

For example, the beginning of a slow collapse of the Greenland ice sheet, which could raise global sea level by about 24 feet (7.4 meters), is one of the most likely tipping elements in a world more than 1.5 C warmer than preindustrial times. Some models place the critical threshold at 1.6 C (2.9 F). More recent simulations estimate runaway conditions at 2.7 C (4.9 F) of warming. Both simulations consider when summer melt will outpace winter snow, but predicting the future is not an exact science.

Bars with gradients show the rising risk as temperatures rise that key systems, including Greenland ice sheet and Amazon rain forest, will reach tipping points.
Gradients show science-based estimates from the Global Tipping Points Report of when key global or regional climate tipping points are increasingly likely to be reached. Every fraction of a degree increases the likeliness, reflected in the warming color.
Global Tipping Points Report 2025, CC BY-ND

Forecasts like these are generated using powerful climate models that simulate how air, oceans, land and ice interact. These virtual laboratories allow scientists to run experiments, increasing the temperature bit by bit to see when each element might tip.

Climate scientist Timothy Lenton first identified climate tipping points in 2008. In 2022, he and his team revisited temperature collapse ranges, integrating over a decade of additional data and more sophisticated computer models.

Their nine core tipping elements include large-scale components of Earth’s climate, such as ice sheets, rain forests and ocean currents. They also simulated thresholds for smaller tipping elements that pack a large punch, including die-offs of coral reefs and widespread thawing of permafrost.

A few fish swim among branches of a white coral skeleton during a bleaching event.
The world may have already passed one tipping point, according to the 2025 Global Tipping Points Report: Corals reefs are dying as marine temperatures rise. Healthy reefs are essential fish nurseries and habitat and also help protect coastlines from storm erosion. Once they die, their structures begin to disintegrate.
Vardhan Patankar/Wikimedia Commons, CC BY-SA

Some tipping elements, such as the East Antarctic ice sheet, aren’t in immediate danger. The ice sheet’s stability is due to its massive size – nearly six times that of the Greenland ice sheet – making it much harder to push out of equilibrium. Model results vary, but they generally place its tipping threshold between 5 C (9 F) and 10 C (18 F) of warming.

Other elements, however, are closer to the edge.

Alarm bells sounding in forests and oceans

In the Amazon, self-perpetuating feedback loops threaten the stability of the Earth’s largest rain forest, an ecosystem that influences global climate. As temperatures rise, drought and wildfire activity increase, killing trees and releasing more carbon into the atmosphere, which in turn makes the forest hotter and drier still.

By 2050, scientists warn, nearly half of the Amazon rain forest could face multiple stressors. That pressure may trigger a tipping point with mass tree die-offs. The once-damp rainforest canopy could shift to a dry savanna for at least several centuries.

Rising temperatures also threaten biodiversity underwater.

The second Global Tipping Points Report, released Oct. 12, 2025, by a team of 160 scientists including Lenton, suggests tropical reefs may have passed a tipping point that will wipe out all but isolated patches.

Coral loss on the Great Barrier Reef. Australian Institute of Marine Science.

Corals rely on algae called zooxanthellae to thrive. Under heat stress, the algae leave their coral homes, draining reefs of nutrition and color. These mass bleaching events can kill corals, stripping the ecosystem of vital biodiversity that millions of people rely on for food and tourism.

Low-latitude reefs have the highest risk of tipping, with the upper threshold at just 1.5 C, the report found. Above this amount of warming, there is a 99% chance that these coral reefs tip past their breaking point.

Similar alarms are ringing for ocean currents, where freshwater ice melt is slowing down a major marine highway that circulates heat, known as the Atlantic Meridional Overturning Circulation, or AMOC.

Two illustrations show how the AMOC looks today and its expected weaker state in the future
How the Atlantic Ocean circulation would change as it slows.
IPCC 6th Assessment Report

The AMOC carries warm water northward from the tropics. In the North Atlantic, as sea ice forms, the surface gets colder and saltier, and this dense water sinks. The sinking action drives the return flow of cold, salty water southward, completing the circulation’s loop. But melting land ice from Greenland threatens the density-driven motor of this ocean conveyor belt by dilution: Fresher water doesn’t sink as easily.

A weaker current could create a feedback loop, slowing the circulation further and leading to a shutdown within a century once it begins, according to one estimate. Like a domino, the climate changes that would accompany an AMOC collapse could worsen drought in the Amazon and accelerate ice loss in the Antarctic.

There is still room for hope

Not all scientists agree that an AMOC collapse is close. For the Amazon rain forest and the North Atlantic, some cite a lack of evidence to declare the forest is collapsing or currents are weakening.

In the Amazon, researchers have questioned whether modeled vegetation data that underpins tipping point concerns is accurate. In the North Atlantic, there are similar concerns about data showing a long-term trend.

A map of the Amazon shows large areas along its edges and rivers in particular losing tree cover
The Amazon forest has been losing tree cover to logging, farming, ranching, wildfires and a changing climate. Pink shows areas with greater than 75% tree canopy loss from 2001 to 2024. Blue is tree cover gain from 2000 to 2020.
Global Forest Watch, CC BY

Climate models that predict collapses are also less accurate when forecasting interactions between multiple tipping points. Some interactions can push systems out of balance, while others pull an ecosystem closer to equilibrium.

Other changes driven by rising global temperatures, like melting permafrost, likely don’t meet the criteria for tipping points because they aren’t self-sustaining. Permafrost could refreeze if temperatures drop again.

Risks are too high to ignore

Despite the uncertainty, tipping points are too risky to ignore. Rising temperatures put people and economies around the world at greater risk of dangerous conditions.

But there is still room for preventive actions – every fraction of a degree in warming that humans prevent reduces the risk of runaway climate conditions. For example, a full reversal of coral bleaching may no longer be possible, but reducing emissions and pollution can allow reefs that still support life to survive.

Tipping points highlight the stakes, but they also underscore the climate choices humanity can still make to stop the damage.

The Conversation

Alexandra A Phillips does not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and has disclosed no relevant affiliations beyond their academic appointment.

ref. What are climate tipping points? They sound scary, especially for ice sheets and oceans, but there’s still room for optimism – https://theconversation.com/what-are-climate-tipping-points-they-sound-scary-especially-for-ice-sheets-and-oceans-but-theres-still-room-for-optimism-265183

The limits of free speech protections in American broadcasting

Source: The Conversation – USA – By Michael J. Socolow, Professor of Communication and Journalism, University of Maine

FCC Chairman Brendan Carr testifies in Washington on May 21, 2025. Brendan Smialowski/AFP via Getty Image

The chairman of the Federal Communications Commission is displeased with a broadcast network. He makes his displeasure clear in public speeches, interviews and congressional testimony.

The network, afraid of the regulatory agency’s power to license their owned-and-operated stations, responds quickly. They change the content of their broadcasts. Network executives understand the FCC’s criticism is supported by the White House, and the chairman implicitly represents the president.

I’m not just referring to the recent controversy between FCC Chairman Brendan Carr, ABC and Jimmy Kimmel. The same chain of events has happened repeatedly in U.S. history.

President Franklin Delano Roosevelt’s FCC chairman, James Lawrence Fly, warned the networks about censoring news commentators.

Then there was John F. Kennedy’s FCC chairman, Newton Minow, who criticized the networks for not airing more news and public affairs programming to support American democracy during the Cold War.

And there was George W. Bush’s FCC chairman, Michael Powell. He decided that a fleeting “wardrobe malfunction” during the 2004 Super Bowl halftime show – when Janet Jackson’s breast was exposed – was sufficient to punish CBS with a fine.

In each of those cases, the FCC represented the views of the White House. And in each case, the regulatory agency was employed to pressure the networks into airing content more aligned with the administration’s ideology.

But what’s interesting in those four examples is that two of the FCC chairmen were Democrats – Fly and Minow – and two were Republicans – Powell and Carr.

As a media historian, I’m aware of the long-existing bipartisan enthusiasm for exploiting the fact that no First Amendment exists in American broadcasting. Pressuring broadcasters by leveraging FCC power occurs regardless of which party controls the White House. And when the agency is used in partisan fashion, the rival party will criticize such politicization of regulation as a threat to free speech.

This recurring cycle is made possible by the fact that broadcasting is licensed by the government. Since a Supreme Court decision in 1943, the supremacy of the FCC in broadcast regulation has been unquestioned.

Such strong governmental oversight separates broadcasting from any other medium of mass communication in the United States. And it’s the reason why there’s no “free speech” when it comes to Kimmel, or any other performer, on U.S. airwaves.

The FCC’s empowerment

Since its establishment in 1934, the FCC’s primary role in broadcasting has been to authorize local station licenses “in the public interest, convenience, or necessity.”

In 1938, the FCC began its first investigation into network practices and policies, which resulted in new regulations. One of the new rules stated that no network could own and operate more than one licensed station in any single market. This forced NBC, which owned two networks that operated stations in several markets, to divest itself of one of its networks. NBC sued.

In the first serious constitutional test of the FCC’s full authority, in 1943, the Supreme Court vindicated the FCC’s expansive power over all U.S. broadcasting in its 5–4 verdict in National Broadcasting Co. v. United States. The ruling has stood since.

That’s why there’s no First Amendment in broadcasting. The Supreme Court ruled that, due to spectrum scarcity – the idea that the airwaves are a limited public resource and therefore not every American can operate a broadcast station – the FCC’s power over broadcasting must be expansive.

The 1934 act, the 1943 Supreme Court decision read, “gave the Commission … expansive powers … and a comprehensive mandate to ‘encourage the larger and more effective use of radio in the public interest,’ if need be, by making ‘special regulations applicable to radio stations engaged in chain (network) broadcasting.’”

The ruling also explains why the FCC can be credited with having created the American Broadcasting Company. Yes, the same ABC that suspended Kimmel in the face of FCC threats was the network that emerged from NBC’s forced divestiture of its Blue Network as a result of the 1943 Supreme Court decision.

The empowerment of the FCC by NBC v. U.S. led to such content restrictions as the Fairness Doctrine, which intended to ensure balanced political broadcasting, instituted in 1949, and later, additional FCC rules against obscenity and indecency on the airwaves. The Supreme Court decision also encouraged FCC chairmen to flex their regulatory muscles in public more often.

A Black woman and white man sing onstage.
A federal appeals court ruled on Nov. 2, 2011, that CBS should not be fined US$550,000 for Janet Jackson’s infamous ‘wardrobe malfunction.’
AP Photo/David Phillip

For example, when CBS suspended news commentator Cecil Brown in 1943 for truthful but critical news commentary about the U.S. World War II effort, FCC Chairman Fly expressed his displeasure with the network’s decision.

“It is a little strange,” Fly told the press, “that all Americans are to enjoy free speech except radio commentators.”

When FCC Chairman Minow complained about television in the U.S. devolving into a “vast wasteland” in 1961, the networks responded both defensively and productively. They invested far more money into news and public affairs programming. That led to significantly more news reporting and documentary production throughout the 1960s and 1970s.

A ‘hands-off’ FCC

In the early 2000s, FCC Chairman Powell promised to “refashion the FCC into an outfit that is fast, decisive and, above all, hands-off.”

Yet his promise to be “hands-off” did not apply to content regulation. In 2004, his FCC concluded a contentious legal battle with Clear Channel Communications over comments ruled “indecent” by shock jock Howard Stern. The settlement resulted in a US$1.75 million payment by Clear Channel Communications – the largest fine ever collected by the FCC for speech on the airwaves.

Powell apparently enjoyed policing content, as evidenced by the $550,000 fine his FCC levied against CBS for the fleeting exposure of singer Janet Jackson’s breast during the Super Bowl. The fine was eventually overturned. But Powell did successfully lobby Congress to significantly hike the amount of money the FCC could fine broadcasters for indecency. The fine for a single incident increased from $32,000 to $325,000, and up to $3 million if a network broadcasts it on multiple stations.

Powell’s regulatory activism, done mostly to curb the outrageous antics of radio shock jocks, resulted in some of the most significant and long-lasting restrictions on broadcast freedom in U.S. history. Thus, Carr’s 2025 threats toward ABC can be viewed in a historical context as an extension of established FCC activism.

Demonstrators holds signs in front of a building with columns.
Demonstrators hold signs on Sept. 18, 2025, outside Los Angeles’ El Capitan Entertainment Centre, where the late-night show ‘Jimmy Kimmel Live!’ is staged.
AP Photo/Damian Dovarganes

But Carr’s threat also appeared to contradict his previously espoused values.

As the author of the FCC section in Project 2025, a conservative blueprint for federal government policies, Carr wrote: “The FCC should promote freedom of speech … and pro-growth reforms that support a diversity of viewpoints.” In exploiting the FCC’s licensing power to threaten to penalize speech he found offensive, Carr failed to promote either freedom of speech or diversity of viewpoints.

If there’s one thing the Carr-Kimmel episode teaches us, it’s that more Americans should know the structural constraints in the U.S. system of broadcasting. Media literacy has proved essential as curbs to free expression – both official and unofficial – have become more popular.

When the FCC threatens a broadcaster, it does so in Americans’ name.

If Americans applaud regulatory activism when it supports their partisan beliefs, consistency demands they accept the same regulatory activism in the hands of their political opponents. If Americans prefer their political opposition show restraint in the regulation of broadcasting, then they need to promote restraint when their preferred administration is in power.

The Conversation

Michael J. Socolow does not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and has disclosed no relevant affiliations beyond their academic appointment.

ref. The limits of free speech protections in American broadcasting – https://theconversation.com/the-limits-of-free-speech-protections-in-american-broadcasting-266206

Industrial facilities owned by profitable companies release more of their toxic waste into the environment

Source: The Conversation – USA (2) – By Mahelet G Fikru, Professor of Economics, Missouri University of Science and Technology

Toxic chemical pollution can come in many forms, including compounds that float on top of water. Brett Hondow/iStock / Getty Images Plus

How much pollution a facility engaged in production or resource extraction emits isn’t just based on its location, its industry or the type of work it does. That’s what our team of environmental and financial economists found when we examined how corporate characteristics shape pollution emissions.

Pollution emissions rates also vary with specific characteristics of the company that owns the facility – such as how many patents it holds, how profitable it is and how many employees it has, according to an analysis we have conducted of corporate pollution data.

We found that industrial and mining facilities owned by profitable companies with relatively few patents and fewer employees tend to release higher proportions of their toxic waste into the environment – into the air, into water or onto soil.

By contrast, industrial sites owned by unprofitable companies with higher levels of innovation and more personnel tend to handle higher proportions of their toxic waste in more environmentally responsible ways, such as processing them into nontoxic forms or recycling them, or burning them to generate energy.

Corporations publish their pollution data

A 1986 federal law requires companies that are in certain industries, employ more than 10 people and make, use or process significant amounts of certain toxic or dangerous chemicals to tell the government where those chemicals go after the company is done with them.

That data is collected by the U.S. Environmental Protection Agency in a database called the Toxics Release Inventory. That data includes information about the companies, their facilities and locations, and what they do with their waste chemicals.

The goal is not only to inform the public about which dangerous chemicals are being used in their communities, but also to encourage companies to use cleaner methods and handle their waste in ways that are more environmentally responsible.

Overall, U.S. companies reported releasing to the environment 3.3 billion pounds of toxic chemicals (1.5 billion kg) in 2023, a 21% decrease from 2014. The decline reflects increased waste management, adoption of pollution prevention and cleaner technologies, in addition to the fact that disclosure requirements motivate companies to reduce releases.

The 2023 releases came from over 21,600 industrial facilities in all 50 states and various U.S. territories, including Puerto Rico, the U.S. Virgin Islands, Guam and American Samoa. One-fifth of the facilities reporting toxic releases in 2023 were in Texas, Ohio and California.

What kinds of businesses release toxic pollution?

Metal mining, chemical manufacturing, primary metals, natural gas processing and electric utilities represent the top five polluting industrial sectors in the U.S. Combined, businesses in those sectors accounted for 78% of the toxic chemicals released in 2023.

Research has found that, often, higher levels of toxic chemical releases come from industrial facilities in less populated, economically disadvantaged, rural or minority communities.

But geography and population are not the whole story. Even within the same area, some facilities pollute a lot less than others. Our inquiry into the differences between those facilities has found that corporate characteristics matter a lot – such as operational size, innovative capacity and financial strength.

In our analysis, we combined the data companies reported to the EPA about toxic chemical releases with financial information on those companies and ZIP-code level geographic and demographic data. We found that corporate characteristics like profitability, employment size and number of patents are more strongly connected with toxic chemical releases than a community’s population density, minority-group percentage or household income.

We looked at what percentage of its toxic chemical waste a facility or mine released to the environment versus how much it treated, recycled or incinerated.

The average facility in our sample, which included 1,976 facilities owned by companies for which financial data is available, released about 39% of its toxic chemical waste to the environment, whether to air, water or land – with the remaining 61% of it managed through recycling, treatment or energy recovery either on-site or off-site.

But facilities in different industries have different release rates. For example, about 99% of toxic chemicals from coal mines are released to the environment, compared with 81% for natural gas extraction, recovery and processing; 25% for power-generating electric utilities; and less than 3% for electrical equipment manufacturers.

The role of innovation

One corporate attribute we examined was innovation, which we measured by counting corporations’ patent families, which are groups of patent documents related to the same invention, even if they are filed in different countries. We found that companies with more patent families tend to release less of their toxic waste to the environment.

Specifically, facilities owned by the top 25% of companies, when rated by innovation, released an average of 32.5% of their toxic waste to the environment, which is 8 percentage points lower than the average of facilities owned by the remaining companies in the sample.

We hypothesize that innovation may give firms a competitive advantage that also enables them to adopt cleaner production technologies or invest in more environmentally conscious methods of handling waste containing toxic chemicals, thereby preventing toxic chemicals from being directly released to the environment.

Size and profitability matter, too

We also looked at companies’ size – in terms of number of employees – and their profitability, to see how those connected with pollution rates at the facilities the company owns.

We found that larger companies, those with more than 19,000 employees, own facilities that release an average of 31% of their toxic chemical waste to the environment. By contrast, facilities owned by midsized companies, from 1,000 to 19,000 workers, release 45%, on average. Those owned by smaller companies, with less than 1,000 employees, release an average of 42% of their toxic chemical waste to the environment.

An important note is that those larger companies, which are more likely to have multiple locations, often own facilities that handle larger volumes of chemicals. So even if they release smaller proportions of their toxic waste to the environment, that may still add up to larger quantities.

We also found that industrial facilities owned by profitable firms have higher average rates of releasing toxic chemicals to the environment than those owned by unprofitable companies.

Facilities owned by companies with positive net income, according to their income statements obtained from PitchBook, a company that collects data on corporations, released an average of 40% of their toxic-chemical-containing wastes to the environment. Facilities owned by companies with negative net income released an average of 31% of their toxic chemical waste to the environment. To us, that indicates that financially strong companies are not necessarily more environmentally responsible. That may be evidence that profitable firms make money in part by contaminating the environment rather than paying for pollution prevention or cleanup.

Our analysis shows that geography and demographics alone do not fully account for industries’ and facilities’ differing levels of pollution. Corporate characteristics are also key factors in how toxic waste is handled and disposed of.

The Conversation

The authors do not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and have disclosed no relevant affiliations beyond their academic appointment.

ref. Industrial facilities owned by profitable companies release more of their toxic waste into the environment – https://theconversation.com/industrial-facilities-owned-by-profitable-companies-release-more-of-their-toxic-waste-into-the-environment-265227

Does the First Amendment protect professors being fired over what they say? It depends

Source: The Conversation – USA (2) – By Neal H. Hutchens, University Research Professor of Education, University of Kentucky

Employees at public and private colleges do not have the same First Amendment rights. dane_mark/Royalty-free

American colleges and universities are increasingly firing or punishing professors and other employees for what they say, whether it’s on social media or in the classroom.

After the Sept. 10, 2025, killing of conservative activist Charlie Kirk, several universities, including Iowa State University, Clemson University, Ball State University and others, fired or suspended employees for making negative online comments about Kirk.

Some of these dismissed professors compared Kirk to a Nazi, described his views as hateful, or said there was no reason to be sorry about his death.

Some professors are now suing their employers for taking disciplinary action against them, claiming they are violating their First Amendment rights.

In one case, the University of South Dakota fired Phillip Michael Cook, a tenured art professor, after he posted on Facebook in September that Kirk was a “hate spreading Nazi.” Cook, who took down his post within a few hours and apologized for it, then sued the school, saying it was violating his First Amendment rights.

A federal judge stated in a Sept. 23 preliminary order that the First Amendment likely protected what Cook posted. The judge ordered the University of South Dakota to reinstate Cook, and the university announced on Oct. 4 that it would reverse Cook’s firing.

Cook’s lawsuit, as well as other lawsuits filed by dismissed professors, is testing how much legal authority colleges have over their employees’ speech – both when they are on the job and when they are not.

For decades, American colleges and universities have traditionally encouraged free speech and open debate as a core part of their academic mission.

As scholars who study college free speech and academic freedom, we recognize that these events raise an important question: When, if ever, can a college legally discipline an employee for what they say?

A university campus with various buildings and trees is seen from above.
An aerial view of University of South Dakota’s Vermillion campus, one of the places where a professor was recently fired for posting comments about Charlie Kirk, a decision that was later reversed.
anup khanal – CC BY-SA 4.0

Limits of public employees’ speech rights

The First Amendment limits the government’s power to censor people’s free speech. People in the United States can, for instance, join protests, criticize the government and say things that others find offensive.

But the First Amendment only applies to the government – which includes public colleges and universities – and not private institutions or companies, including private colleges and universities.

This means private colleges typically have wide authority to discipline employees for their speech.

In contrast, public colleges are considered part of the government. The First Amendment limits the legal authority they have over their employees’ speech. This is especially true when an employee is speaking as a private citizen – such as participating in a political rally outside of work hours, for example.

The Supreme Court ruled in a landmark 1968 case that public employees’ speech rights as private citizens can extend to criticizing their employer, like if they write a letter critical of their employer to a newspaper.

The Supreme Court also ruled in 2006 that
the First Amendment does not protect public employees from being disciplined by their employers when they say or write something as part of their official job duties.

Even when a public college employee is speaking outside of their job duties as a private citizen, they might not be guaranteed First Amendment protection. To reach this legal threshold, what they say must be about something of importance to the public, or what courts call a “matter of public concern.”

Talking or writing about news, politics or social matters – Kirk’s murder – often meets the legal test for when speech is about a matter of public concern.

In contrast, courts have ruled that personal workplace complaints or gossip typically does not guarantee freedom of speech protection.

And in some cases, even when a public employee speaks as a private citizen on a topic that a court considers a matter of public concern, their speech may still be unprotected.

A public employer can still convince a court that its reasons for prohibiting an employee’s speech – like preventing conflict among co-workers – are important enough to deny this employee First Amendment protection.

Lawsuits brought by the employees of public colleges and universities who have been fired for their comments about Kirk may likely be decided based on whether what they said or wrote amounts to a matter of public concern. Another important factor is whether a court is convinced that an employee’s speech about Kirk was serious enough to disrupt a college’s operations, thus justifying the employee’s firing.

Academic freedom and professors’ speech

There are also questions over whether professors at public universities, in particular, can cite other legal rights to protect their speech.

Academic freedom refers to a faculty member’s rights connected to their teaching and research expertise.

At both private and public colleges, professors’ work contracts – like the ones typically signed after receiving tenure – potentially provide legal protections for faculty speech connected to academic freedom, such as in the classroom.

However, the First Amendment does not apply to how a private college regulates its professors’ speech or academic freedom.

Professors at public colleges have at least the same First Amendment free speech rights as their fellow employees, like when speaking in a private citizen capacity.

Additionally, the First Amendment might protect a public college professor’s work-related speech when academic freedom concerns arise, like in their teaching and research.

In 2006, the Supreme Court left open the question of whether the First Amendment covers academic freedom, in a case where it found the First Amendment did not cover what public employees say when carrying out their official work.

Since then, the Supreme Court has not dealt with this complicated issue. And lower federal courts have reached conflicting decisions about First Amendment protection for public college professors’ speech in their teaching and research.

A large gray stone plaque shows the First Amendment in front of a green grassy field and buildings in the distance.
The First Amendment is on display in front of Independence Hall in Philadelphia.
StephanieCraig/iStock via Getty Images Plus

Future of free speech for university employees

Some colleges, especially public ones, are testing the legal limits of their authority over their employees’ speech.

These incidents demonstrate a culture of extreme political polarization in higher education.

Beyond legal questions, colleges are also grappling with how to define their commitments to free speech and academic freedom.

In particular, we believe campus leaders should consider the purpose of higher education. Even if legally permitted, restricting employees’ speech could run counter to colleges’ traditional role as places for the open exchange of ideas.

The Conversation

The authors do not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and have disclosed no relevant affiliations beyond their academic appointment.

ref. Does the First Amendment protect professors being fired over what they say? It depends – https://theconversation.com/does-the-first-amendment-protect-professors-being-fired-over-what-they-say-it-depends-266128

Growing cocktail of medicines in world’s waterways could be fuelling antibiotic resistance

Source: The Conversation – UK – By April Hayes, Microbiologist, Public Health and Sport Sciences, University of Exeter

tawanroong/Shutterstock

Scientists have long been worried about the buildup of antibiotics in the environment.

But in a recent study I led, we wanted to know what happens when bacteria are exposed not just to antibiotics, but to antibiotics and another type of medicine – together, at the low concentrations now typically found in nature.

Up to 90% of the medicines we take pass straight through our bodies, and most are not removed by wastewater treatment plants. These drug residues end up in rivers, lakes and other freshwater systems. In fact, traces of medicines have now been detected on every continent, at concentrations that vary from place to place.




Read more:
Environmental antibiotic resistance unevenly addressed despite growing global risk, study finds


Even tiny amounts of antibiotics can help bacteria evolve defences that make them harder to kill later. These bacteria become fitter, more adaptable, and able to survive doses strong enough to treat human infections. When that happens, the result is antibiotic resistance – a major global health threat. Already, over a million people die each year from infections that no longer respond to treatment, and that number is expected to rise.

What’s less well known is that many other medicines, including drugs for diabetes, depression and pain relief, can also encourage bacteria to become resistant to antibiotics.

Most previous studies, however, have focused on single drugs in isolation. For example, researchers might test how one antidepressant affects bacterial resistance to antibiotics and usually at doses much higher than those found in the environment.

But in the real world, medicines mix together in complex cocktails at low levels, and we still know little about how those combinations behave.

In our latest research, we tested whether a community of bacteria would become more resistant to antibiotics after being exposed to a mixture of drugs. These mixtures included ciprofloxacin – a common antibiotic frequently detected in waterways – combined with one of three other medicines: diclofenac (a widely used painkiller), metformin (a diabetes medication) and an oestrogen hormone used in hormone replacement therapy.

All three combinations changed how the bacteria behaved. We analysed how the bacterial community shifted: which species declined, which thrived and what resistance genes became more common.

We found that these mixtures made the bacterial community less able to grow overall, but also more likely to contain genes that conferred resistance to multiple antibiotics – not just ciprofloxacin, but others that were chemically different. The bacterial mix itself also changed: new species flourished in the presence of the drug combinations that hadn’t done so under antibiotic exposure alone.

I’d tested these same medicines individually in an earlier study, using the same bacteria and similar experimental conditions. On their own, none of the non-antibiotic drugs increased bacterial resistance. But when combined with an antibiotic, the story changed.

Taken together, these studies reveal something important: medicines that seem harmless on their own can amplify each other’s effects when mixed. That’s a big deal, because scientists often test pharmaceuticals one by one and if a single drug shows no obvious effect, it’s typically ignored. Our findings suggest we shouldn’t be so quick to dismiss them.

In the environment, where countless drugs and chemicals coexist, these mixtures may be quietly shaping the evolution of antibiotic resistance. Understanding this hidden interaction is crucial if we want to protect both our health and our ecosystems in the years ahead.

The Conversation

April Hayes receives funding from the Natural Environment Research Council. Her PhD work was supported by AstraZeneca but all work was carried out without input from any funder.

ref. Growing cocktail of medicines in world’s waterways could be fuelling antibiotic resistance – https://theconversation.com/growing-cocktail-of-medicines-in-worlds-waterways-could-be-fuelling-antibiotic-resistance-266945

Could further education colleges get involved with university mergers? It might help meet Keir Starmer’s education goals

Source: The Conversation – UK – By Chris Millward, Professor of Practice in Education Policy, University of Birmingham

Rawpixel.com/Shutterstock

The merger of Kent and Greenwich universities is set to produce the UK’s first “super-university”. This structure will help the universities manage financial risks, while sustaining their distinctive identities. And the merger could also provide a model for the prime minister’s vision for post-compulsory education, outlined recently at the Labour party conference.

Keir Starmer wants two-thirds of young people to enter higher or technical education or apprenticeships. This embraces both further and higher education, and it demands coherence between them. Building on the model agreed between Kent and Greenwich, that could be achieved by colleges joining universities within a single group.

Further education colleges offer a high proportion of the nation’s technical qualifications and apprenticeships, which are central to the prime minister’s target. In towns without universities, colleges provide the route through post-compulsory education. This is often within group structures.

Some already have links with higher education. London South East Colleges, for instance, has seven campuses, which reach south from Greenwich. The group also has a partnership with the University of Greenwich.

Colleges have experienced equal financial challenges to universities, but for longer. They might be wary of joining universities because it could dissipate their distinctive vocational mission. But the model agreed by Kent and Greenwich shows how that can be sustained.

Combining different traditions

While both are universities, the merger of Kent and Greenwich shows it is possible for institutions with very different identities to combine.

Group of students in a study space
Mergers mean institutions can share resources.
Rawpixel.com/Shutterstock

The University of Kent was established in 1965, in the wake of the meritocratic vision for higher education laid out in the 1963 Robbins Report.

This report, produced by the government’s Committee on Higher Education, stated that “university places should be available for all who are qualified by ability and attainment”. It argued that universities should provide a liberal education, rather than meeting employers’ immediate needs. This was embodied in the new maps of learning developed by universities like Kent and their greenfield residential campuses.

Greenwich originates from Woolwich Polytechnic. This was the site from which Labour education minister Tony Crosland announced the expansion of polytechnics in 1965.
Crosland wanted to meet “an ever-increasing need and demand for vocational, professional and industrially based courses”. He also opposed the hierarchy of post-compulsory education, which diminished the status of these courses.

Polytechnics became universities from 1992. Their applied courses then made a pivotal contribution to Tony Blair’s 2001 target for 50% of young people to enter higher education. Blair argued that this would create a society “genuinely based on merit”.

By the time this threshold was passed in 2017, Conservative-led governments had established more universities. Citing Robbins, they expected this to drive higher education expansion through competition and student choice.

Reducing polarisation

Starmer’s speech to the Labour conference signals a different approach. “While you will never hear me denigrate the aspiration to go to university, I don’t think the way we currently measure success in education – that ambition to get to 50% … is right for our times,” he said.

Part of the motivation for this approach comes from a desire to counter Reform UK. People without higher education qualifications are more likely to vote for Reform.

Tackling the dissatisfaction of Reform supporters with highly educated elites requires Starmer to depart from previous assumptions about higher education and meritocracy – that a university education is superior to other pathways through lives and careers. That means placing a higher value on apprenticeships and technical education.

Mergers can improve the financial sustainability of universities and colleges by pooling their risks, operations and investment capacity. For example, a recruitment shortfall in one part of a group can be absorbed by others. Services can be provided at greater scale and lower cost within a group. If investment is needed to build provision in one location, that may be secured through the balance sheet of the whole group.

Investment of this kind is crucial for enhancing teaching quality, learner experiences and reputational standing. But group structures can also minimise course duplication and improve progression arrangements. Rather than competing with each other, colleges and universities within a group can agree course content and admissions requirements.

That enables learners to move seamlessly between different levels and types of education. It also builds connections between towns with colleges and the cities where most universities are based, broadening both study options and job prospects.

Group structures could advance separately in higher and further education. That would encourage competition and hierarchy, rather than coherence and progression. But bringing the two streams of post-compulsory education closer together could help achieve Starmer’s ambition to reduce polarisation. It might also give both universities and colleges some financial breathing room.

The Conversation

Chris Millward does not work for, consult, own shares in or receive funding from any company or organisation that would benefit from this article, and has disclosed no relevant affiliations beyond their academic appointment.

ref. Could further education colleges get involved with university mergers? It might help meet Keir Starmer’s education goals – https://theconversation.com/could-further-education-colleges-get-involved-with-university-mergers-it-might-help-meet-keir-starmers-education-goals-266820