Sunday, November 27, 2022
Home SCIENCE Air pollution can amplify the negative effects of climate change, according to...

Air pollution can amplify the negative effects of climate change, according to a new study

Credit: Unsplash/CC0 Public Domain

The impacts of air pollution on human health, economies and agriculture differ dramatically depending on where on the planet the pollutants are emitted, according to a new study that could give certain countries incentives to reduce emissions that cause climate change.

Led by the University of Texas at Austin and the University of California at San Diego, the study, published September 23 in science advances, is the first to simulate how aerosol pollution affects both climate and air quality in locations around the world.

Aerosols are small solid particles and liquid droplets that contribute to smog and are emitted by industrial factories, power plants, and vehicle exhaust pipes. They impact human health, agricultural and economic productivity in unique global patterns compared to carbon dioxide (COtwo) emissions, which are the focus of efforts to mitigate climate change.

Although COtwo and aerosols are often emitted at the same time during fuel combustion, the two substances behave differently in Earth’s atmosphere, said co-senior author Geeta Persad, an assistant professor in the UT Austin Jackson School of Geosciences.

“Carbon dioxide has the same impact on the climate no matter who emits it,” Persad said. “But for these aerosol pollutants, they tend to stay concentrated close to where they are emitted, so the effect they have on the climate system is very patchy and very dependent on where they come from.”

The researchers found that, depending on where they are emitted, aerosols can worsen the social costs of carbon (an estimate of the economic costs greenhouse gases have on society) by up to 66%. The scientists looked at eight key regions: Brazil, China, East Africa, Western Europe, India, Indonesia, the United States and South Africa.

“This research highlights how the harmful effects of our emissions are often underestimated,” said Jennifer Burney, co-senior author and Marshall Saunders Chancellor’s Endowed Chair in Global Climate Policy and Research in the UC San Diego School of Global Policy and Strategy. “COtwo It’s warming the planet, but it’s also emitted with a bunch of other compounds that directly affect people and plants and cause climate change in their own right.”

The work, which was supported by the National Science Foundation, represents a collaboration between Persad and Burney, who are physical scientists, and a group of economists and public health experts. Coauthors include Marshall Burke, Eran Bendavid, and Sam Heft-Neal of Stanford University and Jonathan Proctor of Harvard University.

Aerosols can directly affect human health and climate independent of COtwo. They are associated with negative health impacts when inhaled, and can affect climate by influencing temperature, precipitation patterns, and the amount of sunlight that reaches the Earth’s surface.

Study the influence of aerosols compared to COtwo, the team created a suite of climate simulations using version 1 of the Community Earth System Model developed by the National Center for Atmospheric Research. They ran simulations in which each of the eight regions produced identical aerosol emissions and mapped how temperature, precipitation and surface air quality were affected around the world. They then connected this data with known relationships between climate and air quality and infant mortality, crop productivity, and gross domestic product in the eight regions.

In a final step, they compared the total social costs of these aerosol-generated impacts with the social costs of co-emitted CO.two in each of the eight regions, and produced global maps of the combined effects of aerosols and COtwo. The researchers said the study is a big step forward from previous work, which only estimated the impacts of aerosols on air quality or did not consider their various global climate effects.

The result paints a varied and complicated picture. Emissions from some regions produce effects on climate and air quality that are two to more than 10 times stronger than in others and social costs that sometimes affect neighboring regions more than the region that produced the emissions. aerosol sprays. For example, in Europe, local broadcasts cause four times more child deaths outside Europe than inside.

But the researchers point out that aerosol emissions are always bad for both the emitter and the planet as a whole.

“While we could think of aerosols, which cool the climate, as having the upside of counteracting COtwo“Driven by global warming, when we look at all of these effects in combination, we find that no region experiences overall local benefits or generates overall global benefits through aerosol emission,” Persad said.

The researchers also said the findings create potentially new motivations for countries to cut emissions and worry about other countries cutting emissions. For example, the study found that adding aerosol costs to COtwo the costs could double China’s incentive to mitigate emissions. And it changes the impact of local emissions in Europe from a net local benefit to a net cost. The study also shows that some emerging economies, such as East African nations and India, might be motivated to collaborate in reducing emissions, as they are heavily affected by each other’s emissions.

The framework developed in this study can also be applied to maximize the societal benefits of current mitigation strategies that are being considered by policymakers. For example, the researchers applied it to the “fair share” approach laid out in the Paris Climate Agreement in which all countries target the same CO2 per capita.two emissions. They found that the approach, while beneficial for climate stability, does not improve mortality or crop impacts from the combination of aerosols and COtwo Emissions because it focuses mitigation on regions that already have fairly low aerosol impacts, such as the US and Europe.

“By expanding the social cost calculations to include the geographically resolved social impacts of co-emitted aerosols, we are showing that the incentive for individual countries to mitigate and to collaborate on mitigation is much greater than if we only think about greenhouse gases. Burney said. he said.


The impact of particulate pollution varies greatly depending on where it originated


Information:
Jennifer Burney et al, Geographically resolved social cost of anthropogenic emissions accounting for direct and climate-mediated effects, Progress of science (2022). DOI: 10.1126/sciadv.abn7307. www.science.org/doi/10.1126/sciadv.abn7307

Provided by the University of Texas at Austin


quotes: Air pollution can amplify the negative effects of climate change, finds a new study (2022, September 23) retrieved on September 23, 2022 from

This document is subject to copyright. Other than any fair dealing for private study or research purposes, no part may be reproduced without written permission. The content is provided for informational purposes only.


RELATED ARTICLES

Unearthing everyday life at an ancient site in Greece

As the sun reached its peak, waves of heat rose from the cypress-clad hills around me. The turquoise waters of the Ionian Sea...

Nobel Prize in medicine awarded for research on evolution

This year's Nobel Prize in Physiology or Medicine has been awarded to Swedish scientist Svante Paabo for his discoveries about human evolution.Thomas Perlmann, secretary...

Do you need to report your COVID self-test results?

The latest spike in COVID-19 infections in California may top last winter's tidal wave, health officials say. And judging by the sewage tests,...

LEAVE A REPLY

Please enter your comment!
Please enter your name here

- Advertisment -

Most Popular

A Guide to Helping Your Partner Overcome PTSD

If you’re reading this, it’s likely that you have a partner who is suffering from post-traumatic stress disorder...

Technology must allow doctors to be doctors

When my doctor walks into the exam room, I want him to pay attention to me, not the computer. Not only is that...

System outages reported at some public hospitals and health facilities in Singapore

Over the past six weeks, system outages have been reported at some public hospitals and health centers of the National Health Group and the...

Mental health crisis teams are no longer just for cities

Tony Leys and Arielle Zionts NEWTON, Iowa — Jeff White knows what can happen when 911 dispatchers get a call about someone feeling down or...