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Geologist helps track lead pollution in a Tibetan glacier, revealing global impact of human activities

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Geologist helps track lead pollution in a Tibetan glacier, revealing global impact of human activities


Geologist tracks lead pollution in a Tibetan glacier, revealing global impact of human activities
Maps showing the locations of the Guliya ice core and other ice cores mentioned in the text. Left map: World map showing the locations of the Guliya drilling site (red triangle) in the western Kunlun Mountains and the location of other ice cores discussed in the text. Right map: Relief map of the Tibetan Plateau (TP) illustrating the movement of the main air masses (westerlies and the summer Indian Monsoon) that influence the region. Glaciers on the TP (right map) are shown in blue. Credit: Communications Earth & Environment (2024). DOI: 10.1038/s43247-024-01724-w

A collaborative research team involving Texas A&M University geologist Dr. Franco Marcantonio has examined the source of lead contamination in a Tibetan glacier, concluding that human activities have introduced the pollutant metal into some of the most remote regions of the world.

The team’s findings, detailed in the paper titled “Source of lead in a Tibetan glacier since the Stone Age,” were recently published in Communications Earth & Environment.

The Tibetan Plateau, a vast highland region in Asia, is often described as the “Roof of the World” because it’s the highest and largest plateau on Earth, located mostly in southwestern China near the Himalayas and roughly four times the size of Texas.

In their analysis of the Guliya Ice Cap within this region, Marcantonio and his colleagues—led by Dr. Roxana Sierra-Hernandez from The Ohio State University—discovered that significant lead pollution reached this area starting in 1974, with the highest levels of contamination occurring between 2000 and 2007.

By analyzing lead isotope ratios within Texas A&M’s Williams Radiogenic Isotope Facility, Marcantino said they were able to trace the main source of this pollution to emissions from Chinese gasoline, which contained lead until its phasedown after 2007.

“Lead is a neurotoxin, and its presence in remote areas like the Tibetan Plateau shows the vast reach of human impact on the environment,” explained Marcantonio, a professor in the Department of Geology and Geophysics and holder of the Jane and Ken R. Williams ’45 Chair in Ocean Drilling Science, Technology and Education. “By studying lead contamination in glaciers, we not only learn about the pollution itself, but also gain valuable insights into atmospheric circulation patterns and the timeline of environmental changes.”

To reach these conclusions, the team measured lead isotope ratios in ice samples from layers that dated back as far as 36,000 years. These ice layers acted as a historical record, allowing the scientists to compare modern lead contamination to levels from pre-industrial times while providing a clear picture of how human activities have affected the environment on a global scale.

The work emphasizes the importance of understanding pollution in remote ecosystems, which could have serious health implications for both humans and wildlife. As Marcantonio continues his research, he plans to trace the movement of contaminant lead across different environments, including the oceans and even the human body.

“There’s still much we don’t know about how lead and other contaminants move through our environment,” Marcantonio said. “By following these pathways, we hope to better understand how pollution spreads and impacts different ecosystems, which can ultimately help us find solutions to reduce contamination and protect human health.”

More information:
M. Roxana Sierra-Hernández et al, Sources of lead in a Tibetan glacier since the Stone Age, Communications Earth & Environment (2024). DOI: 10.1038/s43247-024-01724-w

Citation:
Geologist helps track lead pollution in a Tibetan glacier, revealing global impact of human activities (2024, October 10)
retrieved 10 October 2024
from https://phys.org/news/2024-10-geologist-track-pollution-tibetan-glacier.html

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Threatened pink sea fan coral breeds in UK aquarium for first time

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Threatened pink sea fan coral breeds in UK aquarium for first time


Threatened Pink Sea Fan coral breeds in UK aquarium for first time
Pink Sea Fan spawning. Credit Kaila Wheatley Kornblum

A threatened species of UK coral has been bred for the first time in a UK aquarium, at the Horniman Museum and Gardens in south London.

New photographs capture the landmark lab-based reproduction of the pink sea fan, Eunicella verrucosa, the first time the native temperate coral species has been successfully reproduced in a UK institution.

Pink sea fans are found in coastal waters from western Ireland and southwest Britain to the coasts of West Africa and the Mediterranean.

They are under threat in the UK and classified as vulnerable worldwide on the Red List of Threatened Species, published by the International Union for Conservation of Nature.

The pink sea fans—collected from a wreck off the coast of Teignmouth, south Devon by a team from the University of Exeter—are cared for in the Horniman Aquarium’s Project Coral lab, home to its pioneering coral reproduction research. The spawning is part of University of Exeter Ph.D. student Kaila Wheatley Kornblum’s research into the reproduction, larval dispersal and population connectivity of Eunicella verrucosa.

Supervising her Ph.D. are Professor Jamie Stevens (University of Exeter) and Dr. Jamie Craggs, Principal Aquarium Curator at the Horniman and lead scientist on Project Coral.

Threatened Pink Sea Fan coral breeds in UK aquarium for first time
Oocyte release. Credit Jamie Craggs

Dr. Craggs said, “This marks the first time this species has been spawned and reared in the UK and is a major step forward in conserving the species. It’s wonderful to see the larvae now starting to settle and grow into juvenile sea fans. The success of the spawning is thanks to the exceptional husbandry skills of the Horniman Aquarium team, who are working behind the scenes of our popular aquarium on a number of exciting coral research partnerships.”

Pink sea fans are believed to have been successfully bred by only one other institution, Lisbon Oceanarium, in 2023.

Ms. Kornblum said, “It’s absolutely incredible to witness the eggs being expelled and the larvae swimming around. This is a groundbreaking achievement and offers us a long-awaited opportunity to expand our knowledge on temperate coral reproduction, especially larval development and settlement, key areas highlighted by our group’s previous work but unobserved until now.

“This is a big step in our understanding of the species and conservation of the pink sea fan.”

Citation:
Threatened pink sea fan coral breeds in UK aquarium for first time (2024, October 10)
retrieved 10 October 2024
from https://phys.org/news/2024-10-threatened-pink-sea-fan-coral.html

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part may be reproduced without the written permission. The content is provided for information purposes only.





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Deleting your Facebook may increase your well-being but reduce your political knowledge

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Deleting your Facebook may increase your well-being but reduce your political knowledge


Deleting your Facebook may increase your well-being but reduce your political knowledge
Timeline of Facebook deactivation study during the 2022 French presidential election. Credit: Royal Society Open Science (2024). DOI: 10.1098/rsos.240280

Amid widely shared concerns that social media makes people unhappy, spreads misinformation, and polarizes societies, researchers paid randomly selected participants to deactivate their Facebook accounts during an election, then compared them to a randomly selected group that continued using Facebook.

Their study, published in the journal Royal Society Open Science, directly replicated and extended previous research by sending some participants messages nudging them to be more informed, civil, and open-minded. In the end, these informational messages had little impact.

Deactivating your Facebook social media account might slightly increase your well-being, but reduce your political knowledge, according to the researchers.

As part of their study, 1,117 people voluntarily deactivated their Facebook accounts during the 2022 French Presidential Election. The team surveyed the participants about their mood and well-being, political knowledge, and level of political and social polarization during the election, and compared their results with 1,129 people who did not deactivate their accounts.

They found that people who deactivated their accounts reported having slightly higher well-being, but lower political knowledge. However, they did find that people’s level of political and social polarization did not change despite deactivating their Facebook account.

More information:
Kevin Arceneaux et al, Facebook increases political knowledge, reduces well-being and informational treatments do little to help, Royal Society Open Science (2024). DOI: 10.1098/rsos.240280

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The Royal Society


Citation:
Deleting your Facebook may increase your well-being but reduce your political knowledge (2024, October 10)
retrieved 10 October 2024
from https://phys.org/news/2024-10-deleting-facebook-political-knowledge.html

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Weever stings provide scientists with a unique way of assessing impacts of environment on coastal fish populations

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Weever stings provide scientists with a unique way of assessing impacts of environment on coastal fish populations


Weever stings provide scientists with a unique way of assessing impacts of environment on coastal fish populations
Human and weever fish sting records on beaches in Southwest England from April to November 2018, indicating A) daily mean number of water users across all beaches and observation windows, B) daily mean number of stings across all beaches and observation windows, and C) the number of available observation windows on each day, across all beaches. Credit: Estuarine, Coastal and Shelf Science (2024). DOI: 10.1016/j.ecss.2024.108957

Weever fish are perhaps most commonly known for the painful stings they deliver to beach goers around the UK coastline.

However, a new study has used records of those stings to provide one of the most detailed investigations of how fish populations vary in time and space, in relation to environmental conditions.

The study, by marine scientists at the University of Plymouth, focused on 77 beaches covered by RNLI lifeguards, stretching from Burnham-on-Sea in Somerset, around the north and south coasts of Devon and Cornwall to Exmouth.

The paper is published in the journal Estuarine, Coastal and Shelf Science.

During daylight hours over the space of almost eight months, lifeguards compiled two-hourly estimates of the number of people engaged in different activities (e.g. bathers, surfers) on beaches. They also recorded the number of people requiring assistance after being stung by weever fish, and analyzing that—along with environmental data—provided scientists with a unique window into how environmental conditions affect fish populations.

What were the results?

The team found that between April and November 2018, when the records were compiled, lifeguards observed a total of more than 5.5 million people across the 77 beaches.

The study also showed that 89% of all stings occurred during the peak summer months of June, July and August, with smaller increases coinciding with the Easter and spring half term holidays. Stings tended to occur most often around times of low tide.

Overall, the scientists say, weevers seem to be more active in the shallows of beaches under the same conditions that humans prefer—sunny, calm summer afternoons at low tide.

With similar weever stings levels reported over a wide range of beaches, they also say there is evidence that weevers are suited to a wide range of beach environments and may be resilient to climate-related shifts in beach states.

The research was led by former masters student Ryan Hepburn and Lecturer in Marine Biology Dr. Benjamin Ciotti from the University’s School of Biological and Marine Sciences.

More information:
Ryan Hepburn et al, Drivers of variability in surf zone habitat use by sandy beach fish: Unwitting citizen scientists reveal detailed spatiotemporal patterns, Estuarine, Coastal and Shelf Science (2024). DOI: 10.1016/j.ecss.2024.108957

Citation:
Weever stings provide scientists with a unique way of assessing impacts of environment on coastal fish populations (2024, October 10)
retrieved 10 October 2024
from https://phys.org/news/2024-10-weever-scientists-unique-impacts-environment.html

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Poverty-level wages pose urgent problem for US childcare, study finds

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Poverty-level wages pose urgent problem for US childcare, study finds


nursery school
Credit: Pixabay/CC0 Public Domain

A new report from the Center for the Study of Child Care Employment (CSCCE) at UC Berkeley finds that child care workers in every state struggle with poverty-level wages, even as they nurture and educate our children in the most important years of development.

The 2024 Early Childhood Workforce Index shows that nationally:

  • Early childhood educators are paid a median wage of $13.07/hour, from $10.60 in Louisiana to $18.23 in the District of Columbia;
  • Those hourly rates are not a living wage for a single adult in any state;
  • Nearly half (43%) of childcare workers’ families survive on public assistance like food stamps and Medicaid.

The financial struggles of child care providers and their teachers have gotten worse as federal COVID-era subsidies have expired. “We’re at a crossroads,” said report lead author Caitlin McLean, CSCCE Director of Multistate and International Programs.

“Federal relief funding for child care is gone, and November elections will bring new leadership in 2025 and beyond. This is a critical time to step up, not back for these skilled educators whose support is so crucial for children, families, and the economy.”

“Imagine the impact of public investment that fairly compensates early educators for the important work they do,” said Lea Austin, CSCCE Executive Director and co-author of the report. “We’d see a more stable workforce, and families could find quality, affordable care.”

The report offers guidance to advocates, states, and the federal government on the policies requiring attention. Interactive maps enable you to view and compare workforce demographics and state policies on compensation. Easily see which states are leaders in supporting early educators—and which ones are falling behind.

Economic insecurity remains rampant

The report affirms that early educators have one of the worst-paid jobs in the nation. They earn less than 97% of all other occupations. As difficult as it is for anyone to be an early educator in America, conditions are even more severe for Black and Latina women who, on average, are paid up to $8,000 less than their peers each year, even when they hold equivalent educational degrees.

Pandemic relief and a return of cuts

The essential role early childhood educators play in supporting families and the economy was recognized through the American Rescue Plan Act (ARPA). ARPA and other COVID-19 relief funding provided a lifeline when the pandemic forced many programs to close and at least 100,000 child care jobs were lost.

“Federal emergency funding made my family’s finances the most stable they have ever been,” said Corrine Hendrickson, a home-based child care provider in Wisconsin.

The Index details ARPA-funded initiatives across the states. In Utah, for example, programs paying at least half their staff a minimum of $15 per hour were offered additional public funding.

Now, these cuts are forcing many programs to close or increase costs to parents. “Because our state refuses to invest in child care, I’ve been forced to raise rates $70 a week over the last year,” said Hendrickson, who operates a five-star accredited program. “Yet I’m earning $12 an hour.”

Policies created this mess and policies can fix it

The Index also highlights promising state initiatives. “The Early Childhood Workforce Index shows that early educators’ poor working conditions are not inevitable, but a product of policy choices,” said McLean. “States as varied as Illinois, Kentucky, and Vermont are showing that state and local leaders have the power and authority to advance policies to support the early childhood workforce, with or without federal funding.”

Recommended policies include:

Invest in direct public funding to provide early educators with a living wage, health care, and safe, supportive work environments. For an estimate of a values-based budget for each state, see Financing Early Educator Quality.

Prioritize compensation standards and a wage floor across all settings so no one working in early care and education earns less than a regionally assessed living wage. Create a wage/salary scale that sets minimum standards for pay, accounting for job role, experience, and education levels.

Adopt system-level workplace standards such as guidance on appropriate levels of paid time off for vacation and sick leave, paid planning and professional development time, and mental health and teaching supports.

More information:
Early Childhood Workforce Index 2024: cscce.berkeley.edu/workforce-index-2024/

Citation:
Poverty-level wages pose urgent problem for US childcare, study finds (2024, October 10)
retrieved 10 October 2024
from https://phys.org/news/2024-10-poverty-wages-pose-urgent-problem.html

This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no
part may be reproduced without the written permission. The content is provided for information purposes only.





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