Category: Analysis

Source: The Conversation – USA (2) – By Laura Toran, Professor of Environmental Geology, Temple University

In early January, a giant sinkhole formed at an intersection in the West Oak Lane neighborhood of North Philadelphia after a water main break. Just two weeks earlier, the city reopened a section of the Schuylkill River Trail in Center City that had been shut down for two months due to a sinkhole. Last summer, some residents of Point Breeze in South Philly also waited two months for a sinkhole on their block to be repaired.

Laura Toran is a hydrogeologist and professor emeritus of environmental geology at Temple University. The Conversation U.S. asked her what causes sinkholes, whether Philly is particularly prone to them, and why repairs can take so long.

What are sinkholes and how do they happen?

A sinkhole is a hole that opens up in the ground due to some change in the subsurface.

There are two categories of change that create sinkholes. One type is associated with carbonate rock. This is a type of rock that can develop caves because the rock dissolves when underground water is even slightly acidic. When the bridge over one of these caves collapses, a sinkhole occurs.

The second type is associated with water supply or sewage pipes buried underground. The sediment next to the pipes can erode or wash away when there is a leak in the pipes. That leaves a gap, and if the collapse at the surface becomes big enough, it becomes a sinkhole.

What do we know about the sinkholes in West Oak Lane and on the Schuylkill River Trail?

West Oak Lane experienced two recent water main breaks. Debris from the flowing water made it hard to get to the leak.

Fixing a big leak is a complex job. You have to stop the leak, clear out the debris, get the parts for repair, do the pipe repair, then repair the road. This example also shows that repair teams need to look around to see whether other sections of pipe might be aging and repair them while they have a hole opened up, so you don’t want to rush the job.

The sinkhole on the Schuylkill River Trail late last year, which took two months to fix, was also the result of a pipe leak. The water department had to get involved in the repair, alongside the parks and recreation department. I should point out that the city has a limited budget for pipe repair. As one of the oldest cities in the country, Philadelphia has a lot of work to keep up with.

That said, I would rather try to fix a pipe leak than a carbonate rock sinkhole. With the cavities in carbonate rock, you don’t really know how big they are, and a typical solution is to fill them with concrete. Sometimes you have a much bigger cavity than your supply of concrete.

Is Philly prone to sinkholes?

The Philadelphia region has both types of sinkholes. Within the city, there isn’t carbonate rock present, but just outside the city, such as the King of Prussia area, we see carbonate rock that is subject to sinkholes.

The sinkholes that occur in Philly are where pipes leak and the surrounding soil gets washed away. Because we have the right geology for sinkholes in our region and we have an extensive water network that is aging, sinkholes are somewhat common.

Some regions have even more sinkholes than we see here, however. Florida is entirely underlain by carbonate rock, and sinkholes are quite common.

Can nearby residents know when a sinkhole is forming?

We have a map of carbonate rock in the state, but not all carbonate rock develops sinkholes. Where and when in the carbonate rock a sinkhole is likely to develop is unpredictable.

Sinkholes in Philadelphia tend to also be unpredictable because the driving factor is happening underground and out of sight. We don’t know when a pipe leak is going to occur. Sometimes there is a sagging at the surface before a bigger hole opens up. Sometimes we see the leak before the sinkhole occurs. But not all leaks or sagging ground will lead to a sinkhole, and there won’t necessarily be any warning.

That said, it is important to report leaks and sagging ground so that they can be investigated before getting worse. Report leaks to the Philadelphia Water Department by calling their emergency hotline at 215-685-6300.

If we could replace all the aging infrastructure in the city, we would have fewer sinkholes. However, that would be costly and disruptive, so it really isn’t practical. In the meantime, the city just has to fix new sinkholes as they occur.

Read more of our stories about Philadelphia and Pennsylvania, or sign up for our Philadelphia newsletter on Substack.

Laura Toran receives funding from the National Science Foundation (federal), the Pennsylvania Department of Transportation, and the William Penn Foundation (private).

– ref. Why Philly has so many sinkholes – https://theconversation.com/why-philly-has-so-many-sinkholes-273082

Source: The Conversation – USA (2) – By Carrie Leach, Research Assistant Professor, Wayne State University

For the past 10 years, I have worked on closing the communication gaps that keep older adults at arm’s length from research that could improve their lives.

I worked with Detroiters to bridge the digital divide by developing tools that make it easier for older adults to get online, allowing them to connect to health information and learn about benefits they’re eligible for. I have also codesigned projects with members of the community to help improve older residents’ access to services.

My overriding goal is to help older minority adults connect with research so they are not left out of the very studies meant to reduce health disparities in aging. My work has focused on older adults in Detroit, a majority minority city, to help improve health for all residents.

Despite my best intentions, I recently had an experience where my work created unintended harm for vulnerable people.

I want to share my experience as a cautionary example of how researchers can fail to understand the government benefits that low-income older adults rely on, especially when it comes to research stipends.

Detroit seniors, unplugged

Recently, I completed a project that aimed to bridge both the digital divide and the divide between Detroit residents and researchers.

This project was inspired by the COVID-19 pandemic, when it became clear how hard it was going to be to connect with Detroit residents. Delivering environmental education and outreach is part of my work at the Center for Urban Responses to Environmental Stressors, also known as CURES. In response to the disconnect caused by the lockdown, our team was fortunate to get funding to deliver computers to 1,700 older Detroiters. Our community partners and advisory board members helped us distribute them.

But we soon learned many of the recipients didn’t know how to use the computers, and some couldn’t get online. At the time, Detroit had one of the lowest internet connectivity rates in the nation. Rates were as low as 40% in 2020.

Poor connectivity has been called a “super-determinant” of health. Not being able to access the internet harms individuals because they are cut off from resources that could make them healthier – such as telehealth appointments, for example. It also creates health inequities for groups of people when research lacks a diversity of perspectives.

Naturally, our next step was to develop tools to help the people who received computers get plugged in. We applied for funding, won it – and soon I was working alongside community health and aging advocates, researchers, service providers and housing administrators to develop and refine a technology tool kit.

Once the tool kit was ready, we distributed it widely. The tool kit is designed to cover the basics for older adults who are new computer users. For example, we included directions for connecting to Wi-Fi and creating an email account. We made this resource available for anyone who is interested in using it.

Intro to Research 101

Our community partners next gathered a cohort of 10 Detroiters who were 65 or older so they could learn how to get involved in virtual research. We developed an online research readiness curriculum to introduce them to the basics of how research is done.

Remembering the challenges of COVID-19, we set a goal of engaging the older adults entirely online. Our early meetings started with 45 minutes spent troubleshooting cameras and microphone connections. A few months later, we were all camera-ready in less than nine minutes.

Because I value their time, I budgeted to pay everyone involved in the project. It is difficult for people to take part in programs when they can’t afford to cover basic expenses, and payment can help relieve these financial pressures. What I didn’t realize is that these modest amounts of money could be treated by HUD as income and trigger increases in rent.

But that is exactly what happened.

The older adults involved in our project lived in HUD housing, and their rental costs are based on their income.

We paid residents $120 monthly. This stipend increased their incomes, which in turn led to increases in their rent, sometimes by the same amount as the stipend. Having higher housing costs left them in worse shape than before they joined our project. The stipends were designed to phase out after 10 months, but it was unclear when their rents would be adjusted again. By being involved, their finances became more precarious.

In my opinion, this illustrates how research involvement, even when designed to be fair and respectful, can create an unintended financial strain for people whose budgets leave no room for error.

My privilege was a blind spot.

Problem-solving through partnership

I would likely never have known about the problem if the housing administrator, who was one of my project partners, had not spoken up on behalf of the residents involved in the project. The residents did not come to me to report the issue. They went to a person they already knew and trusted to talk about the unexpected burden.

Some residents stopped accepting payments for their participation, but they still faced months of higher rental costs while we worked to get their money back.

That relief eventually came, thanks to a vigilant HUD administrator, weeks of calls and emails, and late nights spent reviewing HUD’s policies.

In the end, HUD emailed to say it had agreed to exempt the stipends from the residents’ income because we argued that the payments were “temporary, sporadic and nonrecurring.” In response, the HUD site administrator immediately made adjustments, and the overpayments were returned to the residents.

Everyone involved was hugely relieved.

Learning from my mistake

And that may have been the end of the story if one of my community partners, Zachary Rowe, hadn’t encouraged me to write about what happened so that others could learn from our experience.

In my view, this cautionary tale reveals a critical gap in how researchers engage and support people who are underrepresented in studies, including those who rely on housing assistance and other safety net programs. Without attention to these details, efforts to broaden participation in studies can unintentionally exclude or burden the very people researchers are working to include. Experiences like this reinforce that institutions must adapt their policies so paying people for their time never jeopardizes their basic needs.

Researchers, university research review boards and community partners could all benefit from plain‑language guidance about how earnings interact with safety net programs, benefits and income rules. Projects should start with collaborative efforts to anticipate the real-world implications of engagement.

This kind of persistent troubleshooting supports ethical practices and helps build the kind of trust that makes long‑term research partnerships possible.

I view the additional effort and advocacy required to take these precautions as part of the work of shaping who gets represented in research at all. If engaging people with complex lives and constrained resources were easy, our study samples would already be diversified.

Sharing these difficult experiences can be uncomfortable, but it can also help researchers, institutions and partners do better for those who might otherwise be harmed along the way.

Carrie Leach receives funding from NIH.

– ref. Some hard-earned lessons from Detroit on how to protect the safety net for community partners in research – https://theconversation.com/some-hard-earned-lessons-from-detroit-on-how-to-protect-the-safety-net-for-community-partners-in-research-271361

Source: The Conversation – USA (3) – By Jenni Shearston, Assistant Professor of Integrative Physiology, University of Colorado Boulder

I grew up in rural Colorado, deep in the mountains, and I can still remember the first time I visited Denver in the early 2000s. The city sits on the plain, skyscrapers rising and buildings extending far into the distance. Except, as we drove out of the mountains, I could barely see the city – the entire plain was covered in a brown, hazy cloud.

That brown, hazy cloud was mostly made of ozone, a lung-irritating gas that causes decreases in lung function, inflammation, respiratory symptoms like coughing, and can trigger asthma attacks.

Denver still has air pollution problems, due in part to its geography, which creates temperature inversions that can hold pollution near the ground. But since 1990, ozone has decreased 18% across the U.S., reducing the smog that choked many cities in the 1960s and 1970s. The concentration of tiny dustlike particles of air pollution called PM2.5 has also decreased, by 37% since 2000.

These decreases occurred largely because of one of the most successful public health policies ever implemented by the United States: the Clean Air Act, first passed in 1970. The Clean Air Act regulates air pollution emissions and authorizes the Environmental Protection Agency to set air quality standards for the nation.

For years, when the Environmental Protection Agency assessed the economic impact of new regulations, it weighed both the health costs for Americans and the compliance costs for businesses. The Trump administration is now planning to drop half of that calculation – the monetary health benefits of reducing both ozone and PM2.5 – when weighing the economic impact of regulating sources of air pollution.

I am an environmental epidemiologist, and one of the things I study is people’s exposure to air pollution and how it affects health. Measuring the impact of air quality policies – including quantifying how much money is saved in health care costs when people are exposed to less air pollution – is important because it helps policymakers determine if the benefits of a regulation are worth the costs.

What air pollution does to your body

Breathing in air pollution like ozone and PM2.5 harms nearly every major system in the human body.

It is particularly hard on the cardiovascular, respiratory and neurological systems. Numerous studies have found that PM2.5 exposure is associated with increased death from cardiovascular diseases like coronary heart disease. Even short-term exposure to either PM2.5 or ozone can increase hospitalizations for heart attacks and strokes.

In the respiratory system, PM2.5 exposure is associated with a 10% increased risk for respiratory diseases and symptoms such as wheezing and bronchitis in children. More recent evidence suggests that PM2.5 exposure can increase the risk of Alzheimer’s disease and other cognitive disorders. In addition, the International Agency for Research on Cancer has designated PM2.5 as a carcinogen, or cancer-causing agent.

Reducing air pollution has been proven to save lives, reduce health care costs and improve quality of life.

For example, a study led by scientists at the EPA estimated that a 39% nationwide decrease in airborne PM2.5 from 1990 to 2010 corresponded to a 54% drop in deaths from ischemic heart disease, chronic obstructive pulmonary disease, lung cancer and stroke.

In the same period, the study found that a 9% decline in ozone corresponded to a 13% drop in deaths from chronic respiratory disease. All of these illnesses are costly for the patients and the public, both in the treatment costs that raise insurance prices and the economic losses when people are too ill to work.

Yet another study found that nationally, an increase of 1 microgram per square meter in weekly PM2.5 exposure was associated with a 0.82% increase in asthma inhaler use. The authors calculated that decreasing PM2.5 by that amount would mean US$350 million in annual economic benefits.

Especially for people with lung diseases like asthma or sarcoidosis, increased PM2.5 concentrations can reduce quality of life by worsening lung function.

Uncertainty doesn’t mean ignore it

The process of calculating precisely how much money is saved by a policy has uncertainty. That was a reason the Trump administration stated for not including health costs in its cost-benefit analyses in 2026 for a plan to change air pollution standards for power plant combustion turbines.

Uncertainty is something we all deal with on a daily basis. Think of the weather. Forecasts have varying degrees of accuracy. The high temperature might not get quite as high as the prediction, or might be a bit hotter. That is uncertainty.

The EPA wrote in a notice dated Jan. 9, 2026, that its historical practice of providing estimates of the monetized impact of reducing pollution leads the public to believe that the EPA has a clearer understanding of these monetary benefits than it actually does.

Therefore, the EPA wrote, the agency will stop estimating monetary benefits from reducing pollution until it is “confident enough in the modeling to properly monetize those impacts.”

This is like ignoring weather forecasts because they might not be perfect. Even though there is uncertainty, the estimate is still useful.

Estimates of the monetary costs and benefits of regulating pollution sources are used to understand if the regulation is worth its cost. Without considering the health costs and benefits, it may be easier for infrastructure that emits high levels of air pollution to be built and operated.

What the evidence shows

Several studies have shown the impact of pollution sources like power plants on health.

For example, the retirement of coal and oil power plants has been connected with a reduction in preterm birth to mothers living near the power plants. Scientists studied 57,000 births in California and found the percentage of babies born preterm to mothers living within 3.1 miles (5 kilometers) of a coal- or oil-fueled power plant fell from 7% to 5.1% after the power plant was retired.

Another study in the Louisville, Kentucky, area found that four coal-fired power plants either retiring or installing pollution-reduction technologies such as flue-gas desulfurization systems coincided with a drop in hospitalizations and emergency department visits for asthma and reduced asthma-medication use.

Reducing preterm birth, hospitalizations, emergency department visits and medication use saves money by preventing expensive health care for treatment, hospital stays and medications. For example, researchers estimated that for children born in 2016, the lifetime cost of preterm birth, including medical and delivery care, special education interventions and lost productivity due to disability in adulthood, was in excess of $25.2 billion.

Circling back to Denver: The region is a fast-growing data center hub, and utilities are expecting power demand to skyrocket over the next 15 years. That means more power plants will be needed, and with the EPA’s changes, they may be held to lower pollution standards.

Jenni Shearston has received funding from the National Institutes of Health.

– ref. What air pollution does to the human body – https://theconversation.com/what-air-pollution-does-to-the-human-body-273456

Source: The Conversation – USA (3) – By Joanne M. Pierce, Professor Emerita of Religious Studies, College of the Holy Cross

Pope Leo XIV closed the door at St. Peter’s Basilica on Jan. 6, 2026, just days into the new year. The act formally brought the Vatican’s Holy Year 2025 – designated as “Pilgrims of Hope” – to an end.

In 2022, after the COVID-19 pandemic ended, Pope Francis announced his intention to proclaim a Jubilee year, urging the faithful to look to the future “with an open spirit, a trusting heart and far-sighted vision.” That is why, as Francis explained, he chose the motto of the Jubilee: “Pilgrims of Hope.”

Ironically, 2025 was a turbulent year the world over. After so much military aggression in Ukraine, rampant starvation in Gaza and increasing violence of all kinds within the United States, people in many parts of the world were left much more despairing than hopeful for 2026.

Religions typically try to offer hope in the face of despair. As a scholar of Catholicism, I know that even amid violent persecutions, devastating wars and staggering death tolls from epidemics, Christians have repeatedly turned to their holy texts for hope.

So what is the meaning of hope in the Christian tradition?

Western antiquity

Christianity was shaped by its roots in Judaism, but also its rejection of Greco-Roman religious culture, especially its polytheism.

Many ancient Greek authors wrote about a divine spirit of hope – Elpis. As early as the late eighth century B.C.E., the poet Hesiod composed a mythic poem, “Works and Days,” about Pandora and her box of woes. The god Zeus warned that Pandora was not to open the box, given to her as a gift. But in the end, she did – and released all of the entrapped evils to trouble the world. But Elpis – that is, Hope – had also been placed in the box and was kept inside when Pandora closed the lid quickly. The moral of the story is that hope still remains with humanity.

In ancient Rome, hope was venerated as a minor goddess, Spes, but usually on a communal, national level. Politically, Spes represented the collective hope for the Roman Republic or support for the semi-divine emperors of the later empire; temples were erected in her honor, and her image could be found on coins.

Hebrew Scriptures

But for monotheistic Judaism, hope was not an external divine spirit or goddess to be invoked in times of personal or communal need.

In the ancient Near East, the authors of books of the Hebrew Bible spoke frequently about hope. Often expressed with the word “tikvah,” hope is presented in the Bible as a human reaction to God’s promises, “an inner attitude of inner expectation”: a confident trust based on God’s past works.

Early in the Book of Job, the reader meets Job, a righteous man whose faith is tested through the sudden loss of his children, wealth and health. His friend Eliphaz urges him not to give up hope in the midst of Job’s terrible sufferings. He asks: “Is your fear of God not your confidence, and the integrity of your ways your hope?” Job is already living a life of faith and obedience; his reaction should not be to collapse in despair, but to carry on in hope, trusting in God’s wisdom and mercy.

The Psalms were composed as poems or hymns used in worship. In Psalm 62, the psalmist reminds himself and all God’s people of this hope: “My soul, wait in silence for God alone, for my hope is from Him. … Trust in Him at all times, you people.”

The prophets were understood to have been sent by God to chastise the people of Israel for falling into idolatry and other evils and to urge repentance. And some of them stress hope in God as the source for strength in rejecting these worldly temptations and turning back to following the teachings of the Scriptures. The prophet Jeremiah, for example, addresses God as “the hope of Israel” as they repent.

Christian Scriptures

The New Testament, compiled in the first century C.E. contains frequent references to the Old Testament as interpreted through the lens of Jesus’ teaching.

The Gospels rarely use the word hope itself, but imply it obliquely in connection with other elements of faith, such as belief and trust. The Epistles, or letters, by early Christian apostles and their followers, contain frequent references to hope.

For example, in several Epistles, the apostle Paul speaks often about the Christian hope in God through Jesus Christ. In the “Letter to the Romans,” Paul states that, even among difficulties, “hope does not disappoint us, because God’s love has been poured into our hearts.” He praises the Christians in Thessalonika for “your work of faith and labor of love and endurance in hope of our Lord Jesus Christ, before our God and Father.”

But in his first “Letter to the Corinthians,” Paul addresses different kinds of spiritual gifts – some very striking, such as speaking in tongues or healing others. But he then writes a section specifically exploring the most important gift of all, love – in Greek, “agape” – and refers to its relationship with both faith and hope. He closes with a frequently quoted text about what he described as the three greatest Christian virtues: faith, hope and love.

Contemporary hope

Throughout the next centuries, Christian theologians and popes reflected on the nature of hope – either in itself, or within the framework of all three of these virtues.

And so, on Dec. 24, 2025, Francis opened the door of St. Peter’s Basilica to declare the beginning of the Catholic Church’s celebration of the Holy Year, with hope as the special theme.

He would not live to close it. But Leo XIV did, with the following words at the final Jubilee Mass:

“Has the Jubilee taught us to flee from (the) type of efficiency that reduces everything to a product and human beings to consumers? After this year, will we be better able to recognize a pilgrim in the visitor, a seeker in the stranger, a neighbor in the foreigner, and fellow travelers in those who are different?”

From his very first speech after being elected pope, Leo called Christians to reach out to others, build bridges, engage in dialogue and be present to one another.

Perhaps this is what continuing to hope means for the world in 2026.

Joanne M. Pierce 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 ‘hope’ has represented in Christian history – and what it might mean now – https://theconversation.com/what-hope-has-represented-in-christian-history-and-what-it-might-mean-now-273097