¿Por qué la lechuga se queda lacia y se estropea tan pronto?

Source: The Conversation – (in Spanish) – By Victoria Fernández, Researcher, Universidad Politécnica de Madrid (UPM)

siamionau pavel/Shutterstock

Tradicionalmente, hemos aprendido que la función de las hojas es realizar la fotosíntesis (convertir la luz solar en energía química) y evitar que la planta pierda agua. Y así es principalmente, también en el caso de las hojas de lechuga que nos comemos.

Sin embargo, la superficie de las hojas no es un simple escudo, sino un complejo entramado de compuestos químicos con diferentes propiedades en cada zona. Al saber dónde se concentra la debilidad de la lechuga (sus zonas hidrofílicas), podemos plantear buscar nuevos métodos para protegerla, prolongar su duración y mejorar su comercialización.

El impermeable no lo es tanto

Para protegerse, las hojas y otras partes aéreas de las plantas, como flores, tallos o frutos, están cubiertas por una especie de “capa más bien impermeable” hecha de grasa (lípidos), llamada cutícula. Es algo así como un chubasquero natural, pero de composición y estructura variable.

Pero ¿qué pasa si las hojas no son tan impermeables como esperábamos?

Esta idea explica uno de esos enigmas domésticos tan comunes: la lechuga se queda lacia y se estropea muy pronto.

Asomados al nanomundo

Si la cutícula es una capa de grasa impermeable como se ha creído durante siglos, ¿cómo es posible que el agua penetre y salga del interior de las hojas?

Para desvelar este misterio, un equipo multidisciplinar de científicos nos hemos “asomado” al nanomundo de la hoja de lechuga, un nivel de detalle mil veces más pequeño que un cabello humano. Gracias a la microscopía de fuerza atómica y a otras técnicas avanzadas , hemos descubierto que la superficie de las plantas no es un manto de grasa continuo y uniforme, sino que presenta “parches” o heterogeneidad química a micro y nano escala. Lo hemos observado en los pétalos de rosa, las hojas de olivo, y ahora también en las lechugas. Es como si el chubasquero tuviera zonas de tela que repelen el agua y otras zonas que la atraen.

Elegimos la hoja de lechuga para nuestro estudio, por ser un vegetal poco duradero y muy mojable por el agua.

Buscábamos responder a una pregunta: ¿Por qué es tan perecedera y susceptible a la contaminación microbiana esta hoja? Es decir, ¿por qué se estropea tan pronto? ¿Acaso su superficie tiene pocas propiedades de barrera para evitar la deshidratación y el ataque de patógenos?

La lechuga y sus células epidérmicas

En un estudio desarrollado entre la Universidad Politécnica de Madrid, la Universidad de Murcia y la Universidad de Valencia, hemos analizado en detalle la superficie del haz y envés de una variedad de lechuga.

Seleccionamos la lechuga variedad romana, una verdura que todos conocemos y que es muy perecedera. Se deshidrata y estropea rápidamente, y es muy susceptible a la contaminación microbiana. Esto sugiere que su “chubasquero” (la cutícula) no es tan efectivo como barrera de protección, comparado con el de otras plantas.

La superficie de la hoja está compuesta principalmente por dos tipos de células. Por un lado, las células “pavimento”, que actúan como “adoquines” cubriendo la mayor parte de la superficie. Por otro, las células “guarda”, dos células con forma de riñón que se unen para formar una abertura llamada estoma (del griego, stoma, que significa “boca”).

En el envés de las hojas, encontramos una densidad de estomas ligeramente superior. Pero, en general, ambos lados son similares en estructura y composición química.

La función principal de los estomas es abrirse para dejar entrar el dióxido de carbono para la fotosíntesis, aunque a su vez dejan escapar vapor de agua. La apertura estomática está bien regulada a nivel de planta y puede verse afectada por diversas condiciones de estrés.

El análisis de la lechuga reveló algo crucial. Mientras que las células pavimento tienen una superficie bastante homogénea y rica en grasa (repelente al agua), las células guarda que forman el estoma son diferentes. La superficie de los estomas es químicamente heterogénea, diversa. Concentra zonas hidrofílicas (amigas del agua) entre las zonas hidrófobas (repelentes al agua).

Importancia de la heterogeneidad química

Nuestro estudio muestra por primera vez que la superficie de los estomas, aparte de ser rugosa, presenta heterogeneidad química. Y esto, ¿qué significa?

La misión de los estomas es abrirse y permitir la entrada de dióxido de carbono al interior de las hojas para hacer la fotosíntesis, limitando la pérdida de agua. Sin embargo, suponemos que la heterogeneidad química concentrada en la superficie probablemente aporta algún tipo de funcionalidad adicional que aún tenemos que explorar más.

De momento, podemos anticipar posibles implicaciones, como que las zonas hidrofílicas probablemente se asocien a la susceptibilidad de este vegetal a la contaminación por bacterias o virus. También favorecen la pérdida de agua desde el interior de las hojas. Y al perder más agua, se estropean antes durante el proceso posterior a su recolección, incluyendo la comercialización.

Asimismo, es posible que esta composición heterogénea de los estomas limite la pérdida de dióxido de carbono y el transporte de sustancias hidrófobas, además de afectar a las propiedades mecánicas de la hoja.

Estomas de las hojas de lechuga Romana. (A) Imagen de la topografía de un estoma obtenida con un microscopio electrónico de barrido. (B) Sección trasversal de un estoma, observada mediante microscopía electrónica de transmisión. (C) Imagen de microscopía de fuerza atómica (AFM) de un estoma, que muestra una composición química heterogénea, con un diagrama de color que destaca zonas hidrofílicas (azuladas) e hidrófobas. (D) Distribución de los carotenoides en zonas cercanas a un estoma, observadas con microscopía confocal-Raman.

La lechuga es la primera especie hortícola en la que se ha llevado a cabo un estudio tan detallado. Sin embargo, creemos que la caracterización de la superficie de las frutas y hortalizas es un requisito fundamental para buscar métodos que prologuen y mejoren su duración tras la cosecha y alarguen su vida, lo que beneficiará la comercialización.

The Conversation

Victoria Fernández realizado este estudio, dentro de un proyecto financiado con fondos del MCINN/AEI y European Union NextGenerationEU/PRTR, que ha finalizado en Septiembre de 2025.

Ana Cros Stötter recibe fondos de MICINN. Los fondos ya se terminaron (final de septiembre de 2024)

Jaime Colchero recibe fondos de MCINN/AEI y European Union NextGenerationEU/PRTR a través de los proyectos TED2021-130830B, PID2022-139191OB y PDC2023-145906.

ref. ¿Por qué la lechuga se queda lacia y se estropea tan pronto? – https://theconversation.com/por-que-la-lechuga-se-queda-lacia-y-se-estropea-tan-pronto-270530

Joel Mokyr, premio Nobel 2025: cuando la economía trabaja con la historia

Source: The Conversation – (in Spanish) – By Mauro Hernández, Profesor Titular de Historia Económica, UNED – Universidad Nacional de Educación a Distancia

A propósito de las relaciones entre la historia y el análisis económico, el economista estadounidense Kenneth Arrow –laureado con el Nobel en 1972 por sus teorías del equilibrio económico general y de la elección social– escribió:

¿Qué clase de médico se atrevería a diagnosticar o prescribir sin conocer antes la historia clínica del paciente?

Con esta frase, Arrow reconocía que eran mayoría los economistas que diagnosticaban problemas y proponían políticas económicas sin prestar atención a la historia. Y así ha seguido siendo casi hasta ahora.

Otorgar el Nobel de Economía de 2025 al historiador económico Joel Mokyr parece indicar que esa disciplina vuelve a ser un socio relevante en el análisis económico. El propio Banco de Suecia arranca su comunicado con una reflexión en clave histórica:

En los dos últimos siglos, por primera vez en la historia, el mundo ha asistido a un crecimiento económico sostenido.

Economía e historia

Mokyr es un historiador a tiempo completo, cuyas contribuciones al estudio del cambio tecnológico le han merecido el galardón. Y, aunque lo comparte con dos economistas puros (Philippe Aghion y Peter Howitt), el orden en que se anunciaron los ganadores no es casual. Además, Mokyr se llevará la mitad –no un tercio– del premio: 6,5 millones de coronas suecas, unos 467 000 euros aproximadamente.

A este reconocimiento se suma que los dos últimos años también han sido galardonados profesores e investigadores que, aunque no son estrictamente historiadores económicos, sí son economistas que dan a la historia un peso muy relevante. Es el caso de Daron Acemoglu, James A. Robinson y Simon Johnson, (2024) así como el de Claudia Goldin (2023).

Los primeros basaron su explicación del desarrollo en la existencia de dos tipos de élites y marcos institucionales: las extractivas (cuyo fin era maximizar la renta de unos pocos a costa de una mayoría de súbditos) y las inclusivas (que buscaban integrar a todos los ciudadanos en el proceso y el reparto de beneficios del desarrollo). Su argumento se basa en el análisis de numerosos ejemplos históricos de ambos tipos de marco institucional.

Claudia Goldin, por su parte, obtuvo el Nobel –el primero otorgado en solitario a una mujer– por sus investigaciones sobre el papel económico de las mujeres y, en especial, sobre la brecha de género en los salarios.

¿Por qué ahora?

Hasta 1993 nunca se había concedido el premio a un historiador económico. Ese año lo recibieron Robert Fogel (director de la tesis de Goldin) y Douglass North por “haber renovado la investigación en historia económica mediante la aplicación de la teoría y los métodos cuantitativos a los cambios económicos e institucionales”. Tuvieron que pasar tres décadas para que los historiadores económicos volvieran a entrar en el Olimpo sueco.

La pregunta es por qué ahora. Los economistas, y en general los científicos sociales, no creen en las casualidades, y tres premios seguidos es una racha que desafía al mero azar. La clave, creo, se revela al hacer una lectura atenta de los comunicados de concesión del premio. Una acotación: si quieren profundizar más en el tema, el Banco de Suecia distribuye tanto una nota divulgativa como una nota académica, más completa y sesuda.

Nobel 2024: ¿por qué fracasan los países?

En el caso de Acemoglu, Robinson y Johnson, la nota de prensa comienza hablando de la colonización de buena parte del globo por los europeos, un proceso que arranca a finales del siglo XV y por el cual se produjeron grandes cambios en los territorios colonizados. Estos cambios afectarían también a sus instituciones, pero no siempre de la misma forma.

En algunos casos, los colonizadores se dedicaron a explotar a las poblaciones indígenas y los recursos naturales, conformando lo que los autores llamaron unas instituciones y unas élites extractivas. En otros, sin embargo, se produjo una ocupación donde eran más numerosos los colonos europeos, que se dotaron de marcos económicos y políticos inclusivos, abiertos a la participación más o menos libre e igualitaria de todos (no de todas).

La tesis de Acemoglu y Robinson es que sólo los segundos países fueron capaces de salir de la maldición de los recursos –que condena a la pobreza a los territorios donde éstos abundan– y desarrollar economías prósperas y capaces de estimular el crecimiento económico. Se trata, como resulta evidente, de un análisis histórico para un problema económico: por qué fracasan los países.

Nobel 2023: la mujer en el mercado laboral

Claudia Goldin, por su parte, fue premiada por sus investigaciones sobre la participación de la mujer en los mercados de trabajo “a lo largo de los siglos”, como destaca el comunicado de concesión. Este subrayaba cómo Goldin ha buceado en fuentes de archivo para estudiar los cambios en los roles de género en el ámbito laboral. Pero la galardonada también ha publicado estudios de historia económica pura, desde su tesis doctoral (sobre la economía de la esclavitud) hasta diversas publicaciones sobre el papel de las mujeres en los mercados de trabajo en los siglos XIX y XX.

Exactitud matemática versus comprensión histórica

Los tres premios Nobel de Economía de los últimos tres años coinciden en señalar que el análisis histórico es relevante para explicar procesos de largo alcance. Ya sea el crecimiento económico sostenido como resultado de la innovación técnica, el papel de las instituciones en el desarrollo económico o las brechas de género en el empleo y el ingreso.

Todos estos temas se resisten a ser modelizados matemáticamente. Aunque la otra mitad del Nobel 2025 ha recaído en dos economistas modelizadores –Philippe Aghion y Peter Howitt–, su aportación se ciñe a un problema concreto e importante: la destrucción creativa generada por los procesos de innovación, que alteran las estructuras económicas vigentes.

Frente a unas ciencias económicas que llevan décadas afilando unas herramientas metodológicas basadas en las matemáticas y los datos cuantitativos, los últimos premios Nobel nos recuerdan que la exactitud no es lo mismo que la verdad y que los procesos complejos no admiten modelos simples.

Dar respuesta a temas complejos

El mundo se está enfrentando en las últimas décadas a problemas enormemente complejos. ¿Por qué hemos sido incapaces de acabar con la pobreza de tantos países? ¿Cómo es que seguimos sujetos a fuertes ciclos económicos marcados por crisis generales, como la de 2008? ¿Qué tipo de soluciones debemos buscar para un cambio climático que exige cooperación, no competencia? ¿Cómo va a cambiar la inteligencia artificial nuestros modos de producir y consumir? La reflexión y el trabajo de los historiadores económicos, aun con series de datos menos fiables y herramientas econométricas menos sofisticadas, pueden ofrecer respuestas complejas –aunque no necesariamente precisas– a estas preguntas.

Por cierto, aunque se lo den a nuestros colegas historiadores económicos, les recuerdo que el Nobel de Economía no existe: lo que entregará este miércoles 10 de diciembre la Academia Sueca a Joel Mokyr, Philippe Aghion y Peter Howitt será el Premio del Banco de Suecia en Ciencias Económicas, en memoria de Alfred Nobel.

The Conversation

Mauro Hernández recibe fondos de la Agencia Estatal de Investigación (Ministerio de Ciencia e Innovación) como investigador del proyecto “Transformaciones sociales en Madrid y la Monarquía hispánica en la edad moderna. Movimientos ascendentes y descendentes. Entre cambios y resistencias” (PID2022-142050NB-C22) coordinado por José Antolín Nieto (UAM).

ref. Joel Mokyr, premio Nobel 2025: cuando la economía trabaja con la historia – https://theconversation.com/joel-mokyr-premio-nobel-2025-cuando-la-economia-trabaja-con-la-historia-268704

Heptacloro en aguas de lavado industriales: ¿existe en España un mercado negro de plaguicidas prohibidos?

Source: The Conversation – (in Spanish) – By Dr. Borja Garrido Arias, Profesor Dpto. Ingeniería Mecánica, Escuela ICAI, Universidad Pontificia Comillas

Funtay/Shutterstock

Desde hace más de una década, la prohibición de plaguicidas y biocidas con toxicidad elevada y comportamiento recalcitrante (difícil de eliminar) y persistente ha reducido su uso en España. Entre algunos de los ejemplos más representativos destacan los plaguicidas carbamatos, organoclorados, organofosforados y los arsenicales.

No obstante, el caso más llamativo es el del heptacloro, que se va acumulando de forma paulatina en suelo. Puede causar cáncer y actuar como disruptor endocrino, con la capacidad de provocar alteraciones hormonales en medios acuáticos y terrestres.

De entre todos sus impactos nocivos, éste último es el que más preocupa, ya que fomenta la toxicidad neurológica y cambios hormonales tanto en la fauna como en los humanos. Por otro lado, su paso al ciclo del agua y su posterior ingesta producen daños en la salud muchas veces insospechados, ya que la patología surge sin observarse una causa clara ni definida. Además, este tipo de sustancias pueden actuar de forma lenta pero acumulativa.




Leer más:
Peligro silencioso: compuestos químicos que alteran las hormonas tiroideas y el desarrollo fetal


¿No estaba este plaguicida prohibido?

Las políticas ambientales, tanto nacionales como europeas, implantan textos legales muy restrictivos en cuanto a vertidos al medio ambiente. La preocupación no se enfoca en el material de desecho en sí, sino en su composición y en la categoría de toxicidad de los compuestos que lo conforman.

Su caracterización, la determinación de la composición química, física y microbiológica y su análisis cuantitativo resultan procedimientos decisivos e imprescindibles no sólo para su posible reutilización, sino también para su propio vertido bajo el cumplimiento de los estándares establecidos.

El uso del heptacloro lleva tiempo regulado en la recolección y procesamiento de alimentos. La mayor parte de los países define los límites atendiendo a los Límites Máximos de Residuos (LMR), establecidos por organismos tan relevantes como la Organización Mundial de la Salud (OMS).

En España, la comercialización y el uso de heptacloro se prohibieron hace más de tres décadas. No obstante, trazas del pesticida encontradas recientemente en aguas de lavado indican que el uso de este compuesto, totalmente restringido por la normativa, se estaría volviendo a emplear en tratamientos plaguicidas de productos hortícolas.

Después de tantos años prohibido, el heptacloro debería haber desaparecido del medio ambiente, al menos a nivel de concentración de trazas en agua y suelos. Si bien se trata de un producto
muy persistente, el paso del tiempo y los agentes bióticos y abióticos del entorno deberían haber eliminado la mayor parte del mismo.

No obstante, diversos análisis de líquidos procedentes del lavado de productos hortícolas españoles han identificado su presencia, con valores que exceden los niveles mínimos y sospechosos de ser peligrosos. Este problema –que no ocurre en un contexto industrial concreto, sino en varios de forma aleatoria en diferentes muestras– podría revelar la existencia de un mercado negro de pesticidas.




Leer más:
¿Podemos prescindir de los pesticidas para controlar las plagas en cultivos?


Los desafíos de una agricultura productiva que no contamine

Además de determinar y cuantificar la prevalencia del heptacloro, resulta prioritario analizar las causas de su posible posible uso fraudulento. El escenario actual que afronta la agricultura es desafiante. Mientras surgen plagas nuevas con propiedades más agresivas, resistentes e inesperadas, muchos compuestos biocidas o fitosanitarios presentan un bajo poder para reducirlas. Además, las políticas en torno al uso de ciertas sustancias para el sector agrícola son cada vez restrictivas. Se trata de un problema complejo que requiere de soluciones entre muchos agentes.

La importancia de la agricultura en nuestro país obliga a llevar a cabo un control coherente del uso de determinados plaguicidas y a ser conscientes de los riesgos y persistencia de productos como el heptacloro, con tantas repercusiones en el medio ambiente y en la salud.




Leer más:
Cómo eliminar el lindano, un plaguicida prohibido que persiste en los suelos


Por eso resulta urgente aunar entre todos el uso racional del agua y reducir su contaminación. Tóxicos como el heptacloro, entre otros tantos plaguicidas, son difíciles de eliminar y no deberían ser empleados bajo ninguna circunstancia.

Se necesita implementar procesos de depuración más complejos y actualizar la legislación ante procesos nuevos derivados de cambios como la reducción y mayor control de vertidos de determinados productos de higiene personal, tratamientos hormonales o la disminución de aditivos en la síntesis de polímeros de uso cotidiano con los que se elabora ropa, juguetes, envases o dispositivos médicos, entre otros.

También se requiere una mejora del ciclo del agua que permita optimizar recursos hídricos. Una forma de hacerlo es recuperar efluentes (líquidos procedentes de plantas industriales) y estudiarlos para analizar sus distintos orígenes. Todas estas medidas deben llevarse a cabo manteniendo, además, los principios deontológicos de un ingeniero químico: el respeto por el medio ambiente.

La sostenibilidad en el ámbito de la ingeniería química implica el diseño, la implementación y el análisis de modelos que fomenten el ahorro de recursos, la economía circular y el respeto por el medio ambiente, así como por los trabajadores y todos los ciudadanos. Los ingenieros químicos disponemos de medios y financiación que podríamos dirigir a la investigación con el fin de para aportar soluciones factibles, viables y escalables a nivel industrial.

The Conversation

Dr. Borja Garrido Arias no recibe salario, ni ejerce labores de consultoría, ni posee acciones, ni recibe financiación de ninguna compañía u organización que pueda obtener beneficio de este artículo, y ha declarado carecer de vínculos relevantes más allá del cargo académico citado.

ref. Heptacloro en aguas de lavado industriales: ¿existe en España un mercado negro de plaguicidas prohibidos? – https://theconversation.com/heptacloro-en-aguas-de-lavado-industriales-existe-en-espana-un-mercado-negro-de-plaguicidas-prohibidos-265804

PFAS in pregnant women’s drinking water puts their babies at higher risk, study finds

Source: The Conversation – USA (2) – By Derek Lemoine, Professor of Economics, University of Arizona

Studies show PFAS can be harmful to human health, including pregnant women and their fetuses. Olga Rolenko/Moment via Getty Images

When pregnant women drink water that comes from wells downstream of sites contaminated with PFAS, known as “forever chemicals,” the risks to their babies’ health substantially increase, a new study found. These risks include the chance of low birth weight, preterm birth and infant mortality.

Even more troubling, our team of economic researchers and hydrologists found that PFAS exposure increases the likelihood of extremely low-weight and extremely preterm births, which are strongly associated with lifelong health challenges.

What wells showed us about PFAS risks

PFAS, or perfluoroalkyl and polyfluoroalkyl substances, have captured the attention of the public and regulators in recent years for good reason. These man-made compounds persist in the environment, accumulate in human bodies and may cause harm even at extremely low concentrations.

Most current knowledge about the reproductive effects of PFAS comes from laboratory studies on animals such as rats, or from correlations between PFAS levels in human blood and health outcomes.

Both approaches have important limitations. Rats and humans have different bodies, exposures and living conditions. And independent factors, such as kidney functioning, may in some cases be the true drivers of health problems.

We wanted to learn about the effects of PFAS on real-world human lives in a way that comes as close as possible to a randomized experiment. Intentionally exposing people to PFAS would be unethical, but the environment gave us a natural experiment of its own.

We looked at the locations of wells that supply New Hampshire residents with drinking water and how those locations related to birth outcomes.

We collected data on all births in the state from 2010 to 2019 and zoomed in on the 11,539 births that occurred within 3.1 miles (5 kilometers) of a site known to be contaminated with PFAS and where the mothers were served by public water systems. Some contamination came from industries, other from landfills or firefighting activities.

A conceptual illustration shows how PFAS can enter the soil and eventually reach groundwater, which flows downhill. Industries and airports are common sources of PFAS. The homes show upstream (left) and downstream (right) wells.
Melina Lew

PFAS from contaminated sites slowly migrate down through soil into groundwater, where they move downstream with the groundwater’s flow. This created a simple but powerful contrast: pregnant women whose homes received water from wells that were downstream, in groundwater terms, from the PFAS source were likely to have been exposed to PFAS from the contaminated site, but those who received water from wells that were upstream of those sites should not have been exposed.

Using outside data on PFAS testing, we confirmed that PFAS levels were indeed greater in “downstream” wells than in “upstream” wells.

The locations of utilities’ drinking water wells are sensitive data that are not publicly available, so the women likely would not have known whether they were exposed. Prior to the state beginning to test for PFAS in 2016, they may not have even known the nearby site had PFAS.

PFAS connections to the riskiest births

We found what we believe is clear evidence of harm from PFAS exposure.

Women who received water from wells downstream of PFAS-contaminated sites had on average a 43% greater chance of having a low-weight baby, defined as under 5.5 pounds (2,500 grams) at birth, than those receiving water from upstream wells with no other PFAS sources nearby. Those downstream had a 20% greater chance of a preterm birth, defined as before 37 weeks, and a 191% greater chance of the infant not surviving its first year.

Per 100,000 births, this works out to 2,639 additional low-weight births, 1,475 additional preterm births and 611 additional deaths in the first year of life.

Looking at the cases with the lowest birth weights and earliest preterm births, we found that the women receiving water from wells downstream from PFAS sources had a 180% greater chance of a birth under 2.2 pounds (1,000 grams) and a 168% greater chance of a birth before 28 weeks than those with upstream wells. Per 100,000 births, that’s about 607 additional extremely low-weight births and 466 additional extremely preterm births.

PFAS contamination is costly

When considering regulations to control PFAS, it helps to express the benefits of PFAS cleanup in monetary terms to compare them to the costs of cleanup.

Researchers use various methods to put a dollar value on the cost of low-weight and preterm births based on their higher medical bills, lower subsequent health and decreased lifetime earnings.

We used the New Hampshire data and locations of PFAS-contaminated sites in 11 other states with detailed PFAS testing to estimate costs from PFAS exposure nationwide related to low birth weight, preterm births and infant mortality.

The results are eye-opening. We estimate that the effects of PFAS on each year’s low-weight births cost society about US$7.8 billion over the lifetimes of those babies, with more babies born every year.

We found the effects of PFAS on preterm births and infant mortality cost the U.S. about $5.6 billion over the lifetimes of those babies born each year, with some of these costs overlapping with the costs associated with low-weight births.

An analysis produced for the American Water Works Association estimated that removing PFAS from drinking water to meet the EPA’s PFAS limits would cost utilities alone $3.8 billion on an annual basis. These costs could ultimately fall on water customers, but the broader public also bears much of the cost of harm to fetuses.

We believe that just the reproductive health benefits of protecting water systems from PFAS contamination could justify the EPA’s rule.

Treating PFAS

There is still much to learn about the risks from PFAS and how to avoid harm.

We studied the health effects of PFOA and PFOS, two “long-chain” species of PFAS that were the most widely used types in the U.S. They are no longer produced in the U.S., but they are still present in soil and groundwater. Future work could focus on newer, “short-chain” PFAS, which may have different health impacts.

A woman holding a small child fills a glass with water.
If the water utility isn’t filtering for PFAS, or if that information isn’t known, people can purchase home water system filters to remove PFAS before it reaches the faucet.
Compassionate Eye Foundation/David Oxberry via Getty Images

PFAS are in many types of products, and there are many routes for exposure, including through food. Effective treatment to remove PFAS from water is an area of ongoing research, but the long-chain PFAS we studied can be removed from water with activated carbon filters, either at the utility level or inside one’s home.

Our results indicate that pregnant women have special reason to be concerned about exposure to long-chain PFAS through drinking water. If pregnant women suspect their drinking water may contain PFAS, we believe they should strongly consider installing water filters that can remove PFAS and then replacing those filters on a regular schedule.

The Conversation

Ashley Langer receives funding from the National Science Foundation.

Bo Guo and Derek Lemoine 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. PFAS in pregnant women’s drinking water puts their babies at higher risk, study finds – https://theconversation.com/pfas-in-pregnant-womens-drinking-water-puts-their-babies-at-higher-risk-study-finds-270051

Gen Z is burning out at work more than any other generation — here’s why and what can be done

Source: The Conversation – Canada – By Nitin Deckha, Lecturer in Justice Studies, Early Childhood Studies, Community and Social Services and Electives, University of Guelph-Humber

Gen Z workers are reporting some of the highest burnout levels ever recorded, with new research suggesting they are buckling under unprecedented levels of stress.

While people of all age levels report burnout, Gen Z and millennials are reporting “peak burnout” at earlier ages. In the United States, a poll of 2,000 adults found that a quarter of Americans are burnt out before they’re 30 years old.

Similarly, a British study measured burnout over an 18-month period after the COVID-19 pandemic and found Gen Z members were reporting burnout levels of 80 per cent. Higher levels of burnout among the Gen Z cohort were also reported by the BBC a few years ago.

Globally, a survey covering 11 countries and more than 13,000 front-line employees and managers reported that Gen Z workers were more likely to feel burnt out (83 per cent) than other employees (75 per cent).

Another international well-being study found that nearly one-quarter of 18- to 24-year-olds were experiencing “unmanageable stress,” with 98 per cent reporting at least one symptom of burnout.

And in Canada, a Canadian Business survey found that 51 per cent of Gen Z respondents felt burnt out — lower than millennials at 55 per cent, but higher than boomers at 29 per cent and Gen X, at 32 per cent.

As a longstanding university educator of Gen Z students, and a father of two of this generation, the levels of Gen Z burnout in today’s workplace are astounding. Rather than dismissing young workers as distracted or too demanding of work-life balance, we might consider that they’re sounding the alarm of what’s broken at work and how we can fix it.


No one’s 20s and 30s look the same. You might be saving for a mortgage or just struggling to pay rent. You could be swiping dating apps, or trying to understand childcare. No matter your current challenges, our Quarter Life series has articles to share in the group chat, or just to remind you that you’re not alone.

Read more from Quarter Life:


What burnout really is

Burnout can vary from person to person and across occupations, but researchers generally agree on its core features. It occurs when there is conflict between what a worker expects from their job and what the job actually demands.

That mismatch can take many forms: ambiguous job tasks, an overload of tasks or not having enough resources or the skills needed to respond to a role’s demands.

In short, burnout is more likely to occur when there’s a growing mismatch between one’s expectations of work and its actual realities. Younger workers, women and employees with less seniority are consistently at higher risk of burnout.

Burnout typically progresses across three dimensions. While fatigue is often the first noticeable symptom of burnout, the second is cynicism or depersonalization, which leads to alienation and detachment to one’s work. This detachment leads to the third dimension of burnout: a declining sense of personal accomplishment or self-efficacy.

Why Gen Z is especially vulnerable to burnout

Several forces converge to make Gen Z particularly susceptible to burnout. First, many Gen Z entered the workforce during and after the COVID-19 pandemic.

It was a time of profound upheaval, social isolation and changing work protocols and demands. These conditions disrupted the informal learning that typically happens through everyday interactions with colleagues that were hard to replicate in a remote workforce.

Second, broader economic pressures have intensified. As American economist Pavlina Tcherneva argues, the “death of the social contract and the enshittification of jobs” — the expectation that a university education would result in a well-paying job — have left many young people navigating a far more precarious landscape.

The intensification of economic disruption, widening inequality, increasing costs of housing and living and the rise of precarious employment have put greater financial pressures on this generation.

A third factor is the restructuring of work that is taking place under artificial intelligence. As workplace strategist Ann Kowal Smith wrote in a recent Forbes article, Gen Z is the first generation to enter a labour market defined by a “new architecture of work: hybrid schedules that fragment connection, automation that strips away context and leaders too busy to model judgment.”

What can be done?

If you’re reading this and feeling burnt out, the first thing to know is that you’re not overreacting and you’re not alone. The good news is, there are ways to recover.

One of burnout’s most overlooked antidotes is combating the alienation and isolation it produces. The best way to do this is by building connection and relation to others, starting with work colleagues. This could be as simple as checking in with a teammate after a meeting or setting up a weekly coffee with a colleague.

In addition, it’s important to give up on the idea that excessive work is better work. Set boundaries at work by blocking out time in your calendar and clearly signalling your availability to colleagues.




Read more:
Managers can help their Gen Z employees unlock the power of meaningful work − here’s how


But individual coping strategies can only go so far. The more fundamental solutions must come from workplaces themselves. Employers need to offer more flexible work arrangements, including wellness and mental health supports. Leaders and managers should communicate job expectations clearly, and workplaces should have policies to proactively review and redistribute excessive workloads.

Kowal Smith has also suggested building a new “architecture of learning” in the workplace that includes mentorship, provides feedback loops and rewards curiosity and agility.

Taken together, these workplace transformation efforts could humanize the workplace, lessen burnout and improve engagement, even at a time of encroaching AI. A workplace that works better for Gen Z ultimately works better for all of us.

The Conversation

Nitin Deckha is a member of the Institute for Performance and Learning and the Canadian Community of Corporate Educators.

ref. Gen Z is burning out at work more than any other generation — here’s why and what can be done – https://theconversation.com/gen-z-is-burning-out-at-work-more-than-any-other-generation-heres-why-and-what-can-be-done-270237

Parental child abduction: why extending criminalisation is not the answer

Source: The Conversation – UK – By Allison Wolfreys, Lecturer in Law, The Open University

PrasitRodphan/Shutterstock

The government is proposing a change in the law on parental child abduction. The crime and policing bill, under consideration in parliament, would make it a crime for a parent to take their child on holiday and then not return them at the end of the agreed holiday period. This would be punishable by up to seven years’ imprisonment.

The government is attempting to remedy what could be seen as a gap in the law. But this approach fails to take into account what we know about the situations in which this kind of parental child abduction occurs. In many cases, it involves a mother fleeing domestic abuse with her children.

Parental child abduction happens when a child is taken to another country without the other parent’s knowledge or consent, or when one parent takes the children abroad for a holiday and keeps them overseas beyond the agreed holiday period. Currently, the recourse for parents left behind is contained in the 1980 Hague Convention on the Civil Aspects of Child Abduction.

This was created with the objective of minimising harm to children. It enables the left-behind parent to apply to the court in the country the children were taken to for their prompt return. The Convention remains the primary legal instrument of response, with 103 signatory member states.

The crime and policing bill currently before Parliament will leave the 1980 Convention untouched but bolster criminal sanctions against parents who take children by amending the Child Abduction Act 1984, which applies to England and Wales.

The 1984 Act made it an offence for a parent to take or send a child out of the jurisdiction without the other parent’s consent. The parent who took the children is sanctioned only if police pursue a complaint made by the left-behind parent, which is then subject to a decision by the Crown Prosecution Service to prosecute.

Silhouetted man and child
The key focus in existing legislation is the return of children.
KieferPix/Shutterstock

Now, the government seeks to strengthen criminal sanctions against parents who fail to return children. But the proposed seven years’ imprisonment does not align with what research and practice tells us about parental child abduction in 2025.

Profile of the abductor

There was little hard statistical data available on parental child abduction when the Hague Convention was created. However, the abduction of children was primarily seen as something done by fathers who were not the primary carer of their children.

The picture is now very different. Research conducted in 2015 found that 73% of taking parents were mothers, an increase from earlier years, and of these 91% are primary carers. My research and that of other scholars has found that domestic abuse features heavily in these cases. Essentially, these mothers are taking their children and attempting to escape an abusive situation. Research suggests that domestic abuse may be present in approximately 70% of child abduction cases.

If this amendment proceeds, then mothers who have fled overseas with their children to escape an abusive relationship may refuse to return for fear of prosecution. But through the mechanism set up under the Hague Convention, the children can still be ordered to go back. This proposed change in law takes no account of the impact on children of criminalising the parent who will most often be their primary carer. The potential criminalisation of primary carers will inevitably compound the trauma for children at the centre of these cases.

The reasons for parental child abduction are multifaceted and complex. The forum for resolving family law disputes is the family court, and punitive criminal sanctions are likely to cause harm to children. Furthermore, the potential criminalisation of mothers in the context of domestic abuse flies in the face of current government policy to support victims of abuse. It also fails to prioritise the individual needs of children caught up in parental conflict.

It is disappointing to note that the House of Commons has to date given scant attention to this proposed change to the law. It was not debated at report stage (when MPs have an opportunity to consider amendments to a bill).

Currently there are several members of the House of Lords with expertise in family law. Now that the bill has reached committee stage – a detailed examination of each line – in the House of Lords, I hope that they will draw attention to this issue and persuade others that the change in law should be abandoned. These complex cases should be left to the family court where they properly belong.

The Conversation

Allison Wolfreys 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. Parental child abduction: why extending criminalisation is not the answer – https://theconversation.com/parental-child-abduction-why-extending-criminalisation-is-not-the-answer-271019

Warm oceans seem to be turning even ‘weak’ cyclones into deadly rainmakers

Source: The Conversation – UK – By Ligin Joseph, PhD Candidate, Oceanography, University of Southampton

The final week of November was devastating for several South Asian countries. Communities in Sri Lanka, Indonesia and Thailand were inundated as Cyclones Ditwah and Senyar unleashed days of relentless rain. Millions were affected, more than 1,500 people lost their lives, hundreds are still missing, and damages ran into multiple millions of US dollars. Sri Lanka’s president even described it as the most challenging natural disaster the island has ever seen.

When disasters like this happen, the blame often falls on a failure in early warnings or poor preparedness. This was the case with major floods in Kerala, south India, in 2018, which devastated my hometown.

But this time, the forecasts were largely accurate; the authorities knew the storms were coming, yet the devastation was still immense.

So, if the forecasts were good enough, why were the impacts still so severe?

Weak winds, extreme rain

One emerging explanation is that these storms were not dangerous because of their winds, but because they produced unusually intense rainfall.

Graph of wind speeds
This graph of all cyclonic storms over the north Indian Ocean since 2001 shows Ditwah and Senyar weren’t particularly windy. (Wind speed measured in knots. 1 knot is about 1.15 mph or 1.85 kph)
Ligin Joseph (data: IBTrACS), CC BY-SA

Consider Cyclone Ditwah. Its peak winds were around 75 km/h (47 mph). That’s windy, but nothing special. In the UK, it would be classified merely as a “gale” rather than a “storm”. It was far weaker than the 220 km/h winds of the powerful 1978 cyclone that also struck Sri Lanka. Yet Ditwah still caused massive devastation.

What explains this apparent contradiction? It’s too early to say definitively, but climate change is likely a part of the story. Even when storms are not especially strong in wind terms, the amount of rain they carry is increasing.

A warmer atmosphere holds more water

A well established meteorological rule helps explain why. For every degree of global warming, the atmosphere can hold about 7% more moisture.

As the planet warms, the air above us becomes a larger reservoir, waiting to dump more water on us. When storms form, they can tap into this expanded supply, often in extremely short bursts. Even if wind speeds are modest, the rainfall alone can be catastrophic.

The oceans matter even more

Warming oceans play an even more powerful role, as cyclones draw their energy from warm ocean waters. Satellite data from late November shows just how warm the eastern Indian Ocean was, with large areas more than 1°C above normal during Ditwah and Senyar.

Coloured map of Indian Ocean and SE Asian seas
In the days before the cyclones formed (20–24 November), the oceans were even warmer than usual, creating conditions that could have fuelled and intensified the rainfall.
Ligin Joseph (Data: OISST; track positions are approximate), CC BY-SA

Such warm anomalies are no longer unusual. The oceans have absorbed more than 90% of the excess heat trapped by greenhouse gases, and long-term observations show a clear upward trend in ocean temperatures.

That doesn’t necessarily mean cyclones are becoming more frequent – their formation still depends on other ingredients, such as low wind shear (small differences in wind speed and direction with height) and the right atmospheric structure.

What warmer oceans do change, however, is the amount of energy available to any storm that does manage to form. When the ocean is warmer, cyclones have more fuel and evaporation increases, loading the atmosphere with moisture that can fall as intense rain once a storm develops. Even weak cyclones can therefore hold exceptional amounts of rain.

Coloured map of Indian Ocean and SE Asian seas
Evaporation averaged for 26–27 November. Ditwah especially travelled over warm waters supplying large amounts of moisture to the atmosphere.
Ligin Joseph (Data: ERA5), CC BY-SA

The winds near the surface help this process along. As they move across the ocean, they sweep away the moisture-filled air just above the water and replace it with drier air, allowing evaporation to continue. Put together, warmer oceans, higher evaporation, and an atmosphere that can store more moisture, these factors can significantly intensify the rainfall associated with cyclones.

Coastline hugging makes flooding worse

Local geography amplified these effects. Both Ditwah and Senyar formed unusually close to land and travelled along the coastline for an extended period. This meant they stayed over warm waters long enough to continuously draw moisture, but remained close enough to land to dump that moisture as intense rainfall almost immediately.

Cyclone Ditwah, in particular, moved slowly as it approached Sri Lanka. Slow-moving storms can be especially dangerous as they repeatedly dump rain over the same area. Even if winds are weak, this combination of warm seas, coastal proximity and slow forward speed can be devastating.

A new threat

These storms suggest that climate change – especially ocean warming – is reshaping the risks posed by cyclones. The most dangerous storms may no longer simply be the ones with the strongest winds, but also the ones with the most moisture.

Forecasting systems, including new AI-powered weather models, are getting better at predicting cyclone tracks and wind speeds. Yet rainfall-driven flooding remains far harder to forecast. As oceans continue to warm, governments and disaster agencies will need to prepare for storms that may be weak in wind but extreme in rain.

These insights are based on preliminary analysis and emerging scientific understanding. More detailed peer-reviewed studies will be needed to pinpoint exactly why Ditwah and Senyar produced such extreme rainfall. But the pattern that is emerging – weak cyclones delivering outsized floods in a warming world – must not be ignored.

The Conversation

Ligin Joseph receives funding from the UK’s Natural Environment Research Council (NERC).

ref. Warm oceans seem to be turning even ‘weak’ cyclones into deadly rainmakers – https://theconversation.com/warm-oceans-seem-to-be-turning-even-weak-cyclones-into-deadly-rainmakers-271550

Nigel Farage accused of breaking election spending laws – the situation explained

Source: The Conversation – UK – By Sam Power, Lecturer in Politics, University of Bristol

Nigel Farage has found himself in hot water over accusations that he failed to report that his 2024 election campaign in Clacton went over the spending limit of £20,660.72. Richard Everett, a former Reform councillor (who has since left the party – or been expelled, depending what you read), has submitted documents to the police.

Election spending in the UK is beyond complex. It is so hard to understand that it has been compared to a “Jane Austen-style intricate dance … all sorts of daring and dicey moves are permissible, provided you know precisely where to step and when, and how not to upset the crowds”.

Nowhere is this truer than when it comes to spending limits. There are, in fact, two spending limits for general elections (well, there’s actually more than two but let’s not go there). Each party has a certain amount to spend at the national level and each candidate has a spending limit for their constituency campaign. Candidate spending is money spent to promote their individual candidacy (or criticise a local opponent), party spending is more general material that promotes a party.

This is largely thanks to a historical quirk. Candidate spending has been limited since the Corrupt and Illegal Practices (Prevention) Act of 1883. And because national campaigning didn’t really exist back then, that was largely that. Things changed in 2000 when – alongside other reforms – limits were placed on national-level party spending, which by then was, by then, very much a thing.

Both spending limits vary, but the 20k limit for Clacton is a reasonable rule of thumb to extrapolate across other constituencies. Party spending limits, again as a rule of thumb, are £34.1 million (if a party stands across England, Scotland and Wales). So, quite a difference.

As you’d imagine, parties make all kinds of daring moves to get what looks an awful lot like candidate spending into their much larger national budgets. You might, for example, target national messages (so party spending) at target constituencies – and, as long as you don’t mention the candidate, that’s party spend.

You can still end up in hot water, though. Just ask the 30 or so Conservative MPs (and their staff) who were embroiled in an election expenses episode following the 2015 general election. In this instance the Tories drove a battle bus packed with activists drove around 33 target constituencies and reported most of their spending as party, rather than constituency, spending.

How bad is this for Farage?

With the police looking into the claim, there’s only so much one can say, but there are several reasons to think the Clacton spend is not going to be too much of a problem for team Farage. Firstly, there’s a very basic matter of the statute of limitations on cases of this kind. You only have a year to report suspected offences and we’re already more than a year out from the election.

While prosecutors can have that limit waived in certain circumstances, a further complication of electoral law is that candidate offences (for now) are managed by the police and party offences by the Electoral Commission. The police are very reluctant to get involved in party politics so it would be surprising if they actively pursued the case against Farage.

Signs reading 'vote Reform' planted on a roadside bank.
Reform campaign signs in Clacton in 2024.
Shutterstock/GregSawyer

We also don’t know how much more than his £20k limit Farage is accused of spending. If it’s a small amount, the Crown Prosecution Service (CPS) may not feel it in the public interest to pursue a case.

The burden of proof is also incredibly high. I suspect that the offence the CPS will be investigating is the same as the Tory battle bus affair, so 82(6) of the Representation of the People Act 1983. This states that “if a candidate or election agent knowingly makes the declaration required by this section falsely, he shall be guilty of a corrupt practice”. So, the CPS does not just have to show the overspend, it has to show that the candidate knew they were overspending.

There’s also the complicating factor that this is Farage’s constituency, and he effectively is the Reform party. Given that he is the face of all Reform campaigning, we have to wonder, truly, in this instance where candidate spending begins and party spending ends. Or, put differently, considering how easy it would be in theory to disguise candidate spending at party spending in these particular (and peculiar) circumstances you’d. Election law is a complicated dance after all, but this is little more than a two-step.

These headlines come at a tricky moment for Farage as he has faced over a week of allegations that he made racist comments during his school days. That said, I doubt there’ll be any great panic in Reform HQ. For one, even Everett has suggested that Farage was “blissfully unaware” of the omissions. If charges are brought, it will likely not be against him and therefore easily blamed on his local agent or other administrators.

Also, as I suggested way back in 2016, accounting just isn’t very sexy. Again, the battle bus saga is instructive here as it was genuinely big news at the time. Some even thought it had the potential to become the new expenses scandal. But it didn’t. One person was convicted, while everyone else was acquitted and moved on.

Attacking electoral law is also fertile ground for Farage. He has already turned a defence over racism allegations into an attack on his opponents, there’s very little to suggest he won’t do the same here. He and his supporters generally relish the prospect of a skirmish with the establishment.

This would be, put lightly, a shame. Election law is hard to understand and mistakes happen, but that doesn’t mean those enforcing it are pen pushers looking for wrongdoing to punish. We may well live in the age of the politics of grievance and hot air, but just this once it would be nice to let the process play out.

The Conversation

Sam Power has received funding from the Engineering and Physical Sciences Research Council and the Economic and Social Research Council.

ref. Nigel Farage accused of breaking election spending laws – the situation explained – https://theconversation.com/nigel-farage-accused-of-breaking-election-spending-laws-the-situation-explained-271546

From concrete walls to living edges, here’s how riverside habitats are being restored along the Thames

Source: The Conversation – UK – By Wanda Bodnar, PhD Candidate, Marine and Estuarine Science, UCL

The Thames estuary in southeast England — the tidal stretch of the river — once supported extensive saltmarshes, seagrass meadows and oyster beds. These shallow areas, which flood and drain with the tides, provided vital feeding and nursery grounds for fish. But centuries of urban development have replaced them with concrete walls, docks and flood defences.

Much of this change happened in the Victorian era. The Thames embankment straightened and hardened the river’s edge, severing the natural connection between land and water. Today, barely 1% of those original intertidal habitats — the shallow zones between the low and high tide mark — remain. But while the physical landscape has continued to shrink, the condition of the water has taken a very different path.

Since the 1960s, water quality has improved dramatically, and more than 125 fish species have been recorded in the Thames river system. Some even spawn in the Thames. With stable oxygen levels and declining pollution, the river has made an impressive biological recovery — but not a physical one. Fish have returned, but the habitats they depend on have not. With so few natural areas left today, young fish have far fewer places to feed and grow than they once did.

Restoring life at the edge

To counter this loss, new aquatic habitats have been created across London over the past 25 years. The Estuary Edges project — led by the Thames Estuary Partnership with the Environment Agency and the Port of London Authority — shows how to soften hard riverbanks and make space for wildlife.

These created or “engineered” habitats come in many shapes and forms. Some are “setbacks”, where parts of the river wall are opened or moved back to allow tides to flood naturally. Others are gently sloping vegetated terraces. These are sections of hard wall or steep bank that have been reshaped and planted with aquatic and saltmarsh plants to recreate a more natural edge.

Even vertical walls can be improved by adding ledges and textured surfaces. These features give aquatic wildlife places to cling, feed and shelter.

Between 2017 and 2023, nine “estuary edges” sites were surveyed, from Barking Creek to Wandsworth in London. Using specialised nets, more than 1,000 fish were recorded — including gobies, seabass and the critically endangered European eel. Almost all were juveniles, showing that even small, vegetated areas can shelter young fish in the heart of London. The surveys also showed that design and time matter. Habitats with gentle slopes, channels and good water flow supported more fish. Sites with barriers or poor drainage often trapped water — and fish — on the falling tide.

At Greenwich Millennium Terraces, an area of the peninsula that was redeveloped in 1997, a natural drainage channel formed over the years. By 2023, the site supported mullet, flounder and many eels. At Barking Creek, a tidal channel that reformed after reed overgrowth restored fish access and increased diversity. The neighbouring setback site, built in 2011, kept water flowing throughout the tide and consistently supported gobies, seabass, flounder and eels.

These examples show that habitat creation works — but they also highlight significant knowledge gaps. Compared with decades of research on water quality, studies on habitat function remain limited, especially across different habitat types and levels of human impact.

Further downstream, the Transforming the Thames project is now scaling up restoration. Led by the Zoological Society of London, it focuses on the outer estuary, where there is more space to restore and reconnect habitats.

Together, Estuary Edges and Transforming the Thames offer complementary approaches to habitat recovery: creating new habitats along the urban river edge while restoring those lost across the broader estuary.

This connection underpins my PhD research. I study how fish use natural, degraded, created and restored habitats across the Thames. By combining environmental DNA with net surveys, diet analysis, and stable isotope techniques, I explore how fish feed, move and interact with different habitat types. This helps reveal how these habitats support fish — and how fish respond as restoration progresses.

Creating and restoring habitats is not only about helping fish and other wildlife. Shallow, plant-rich edges stabilise sediments, absorb waves, improve water quality and strengthen climate resilience. They also create peaceful “blue havens”: places where people can reconnect with the river.

Once declared “biologically dead”, the Thames has made a remarkable comeback. Its revival story, however, is still being written.


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The Conversation

This article draws on decades of research and collaboration across the Thames Estuary, made possible by the work of many individuals and organisations. I am especially grateful to Steve Colclough, whose long-standing work continue to influence restoration efforts across the region. I worked full-time at the Thames Estuary Partnership between 2018 and 2024, and I am now undertaking a NERC-funded PhD jointly hosted by Queen Mary University of London, the Institute of Zoology and University College London.

ref. From concrete walls to living edges, here’s how riverside habitats are being restored along the Thames – https://theconversation.com/from-concrete-walls-to-living-edges-heres-how-riverside-habitats-are-being-restored-along-the-thames-269420

What the US national security strategy tells us about how Trump views the world

Source: The Conversation – UK – By Andrew Gawthorpe, Lecturer in History and International Studies, Leiden University

Russia has called US president Donald Trump’s new national security strategy ‘largely consistent’ with Moscow’s vision. Photo Agency / Shutterstock

The White House has released its national security strategy, a document put out by every US presidential administration in order to spell out its foreign policy priorities. These documents are legally required to be released by Congress and are typically written by a committee. Still, they bear the president’s signature and usually serve as a distillation of how the current commander in chief views the world.

This latest document is no exception. But perhaps even more so than any previous national security strategy, it reflects a focus on the views and activities of the current president. It touts supposed achievements of the Trump administration in a way that would be more appropriate in a campaign speech. And at numerous points, it lavishes praise on Donald Trump for upending conventional wisdom and setting US foreign policy on a new course.

So what can we learn from this document about how Trump views the world? Three themes stand out. The first is that, contrary to some claims, Trump is not an isolationist. He doesn’t want to pull the US back from foreign entanglements completely. If he did, it would hardly make sense to boast of having brokered eight peace deals or of having damaged Iran’s nuclear programme.

Like more traditional national security strategy documents, the latest one still portrays the US as having a responsibility for global peace and prosperity. But within that broad remit, it has a new set of priorities.

The most striking is the focus on the western hemisphere. Whereas recent administrations have identified the containment of China as their key priority, Trump vows he will “restore American preeminence in the western hemisphere”. Yet the only concrete “threats” the document identifies as originating in the region are drug cartels and flows of irregular migrants.

Viewed from the standpoint of previous administrations, this makes little sense. US foreign policy has usually been concerned mainly with grave security threats, particularly from Russia and China. Drugs and migrants were less important than nuclear weapons and aircraft carriers.

Trump views things differently. From his perspective, dangerous narcotics and migrants who he has previously said are “poisoning the blood” of the US are much more direct threats to the American people. Putting “America First”, to use Trump’s favourite phrase for describing his own foreign policy, means focusing on them.

But this does not mean Trump is isolationist. Protecting the American people, even in the way Trump understands it, means having an active foreign policy.

The second key theme of the document is its attitude towards “civilisation”. In it, Trump has returned to a central aspect of his political rhetoric – that “western civilisation” is under attack from a combination of hostile migrants, spineless liberals and cultural degeneracy. Just as Trump appears to see himself as leading the fightback against these forces in the US, he wants others to do the same.

In passages that have sent shockwaves through Europe’s political establishment, the national security strategy lambasts European governments for allegedly welcoming too many migrants, persecuting far-right political parties and betraying the west’s civilisational heritage.

Again, these are not the words of an isolationist. They are the words of someone who, as I have concluded in my own research, views themselves as the protector of a racially and culturally defined civilisation that covers both the US and Europe.

The particularism here is striking. Whereas past US national security strategies spelled out a desire for Washington to spread liberal democracy throughout the world, Trump’s document says this is an unachievable goal. Instead, he seems to be interested primarily in the destiny of white Europeans – and in shaping their democracy and values to conform with his own.

The national security strategy warned that several countries risk becoming “non-European” due to migration, adding that if “present trends continue, the continent will be unrecognisable in 20 years or less”. This is a stance that some observers say echoes the racist “great replacement theory”, a comparison the White House has branded as “total nonsense”.

The third and final theme that stands out from the document is its intensely economic focus. The most detailed parts of the document relate to economic statecraft – how to reshore industries to the US, reshape the global trading system and enlist US allies in the mission of containing the economic rise of China.

Regional security matters, by contrast, receive much less attention. Russia’s ambitions in Europe are barely mentioned as a problem for the US, and Taiwan merits only a paragraph. Indeed, the Kremlin has said the new strategy is “largely consistent” with its vision.

Rarely has a US national security strategy been so transactional. In its discussion of why the US will support Taiwan, the document only invokes the island’s semiconductor industry and strategic position as reasons. Not a word is said about the intrinsic worth of Taiwanese democracy or the principle of non-aggression in international law.

The impression this leaves is that, in foreign policy, Trump prioritises economics over values. He views leaders such as China’s Xi Jinping and Russia’s Vladimir Putin not as implacable dictators hell-bent on regional domination, but as possible business partners. He seems to believe the focus of foreign policy ought to be to maximise profits.

For US allies in Europe and Asia, this raises an uncomfortable question: what if the profitable thing to do turns out to be to abandon them and strike a grand bargain with Russia or China? Based on this document, they have little reason to think Trump will do anything else.

The Conversation

Andrew Gawthorpe is affiliated with the Foreign Policy Centre in London.

ref. What the US national security strategy tells us about how Trump views the world – https://theconversation.com/what-the-us-national-security-strategy-tells-us-about-how-trump-views-the-world-271438