Improving the quality of the air we breathe is a significant achievement for public health, but paradoxically, it also accelerates global warming. This is highlighted in a recent study published in Communication Earth and the Environment, which connects the recent efforts to clean up air pollution in East Asia to the intensified climate crisis.
In the last 15 years, global warming has surged dramatically, and until now, the reasons behind this surge were unclear to scientists.
Co-author Dr. Robert Allen, a professor of climate studies at the University of California, Riverside, stated:
To address this, a large team of international scientists examined simulations from eight major climate models.
The majority of the accelerated warming seen since 2010 is believed to stem from efforts to reduce air pollution in East Asia.
During this same period, China was implementing a significant air quality policy that led to a reduction of sulfur dioxide emissions by approximately 75%.
Dr. Bjørn Samset, the lead author of the research and a senior researcher at Norway’s International Climate Environmental Studies Centre, explained to BBC Science Focus that pollution has historically been effective in cooling the planet.
“Think back to a day when the air was polluted or hazy,” he mentioned. “Particles in the air block some sunlight from reaching the ground, effectively providing a cooling shade.
“For decades, air pollution has been helping to mitigate some of the warming caused by greenhouse gases.”
Samset elaborated that by eliminating air pollution, as China has done, some of that cooling effect has been lost.
However, simply allowing pollution to persist is not the answer. Allen noted that 2 and methane must both be addressed together.
In addition to cutting greenhouse gases, some scientists have proposed unconventional measures to slow the climate crisis, such as reintroducing artificial pollution into the atmosphere.
Samset explained that this approach “involves releasing particles into the stratosphere or clouds, which can mirror the cooling effects of air pollution without the harmful health impacts.”
To do this, planes could disperse gas from altitudes of 20 km—significantly higher than typical passenger flights.
However, co-author Professor Laura Wilcox, a meteorologist at the University of Reading, advised in BBC Science Focus that such solutions do not resolve the core issues.
“Similar to air pollution, these methods merely mask atmospheric problems without addressing the root causes,” she stated.
“Another viable strategy is to actively remove CO.2,” she added. “This process, known as carbon capture, is already underway but on a limited scale.”
Possible solutions include planting trees and seaweed, developing mechanical trees, and directly capturing CO2 from the air for storage in rock formations.
Nevertheless, the key solution remains to “reduce greenhouse gas emissions primarily by transitioning away from fossil fuels,” said Samset.
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About our experts
Dr. Bjørn Samset is a senior researcher at the Norwegian Centre for International Climate Research. A physicist and science communicator, he possesses extensive expertise in atmospheric science and global climate modeling, focusing on the impacts of air pollution on climate change through climate modeling.
Professor Laura Wilcox is a professor specializing in aerosol climate interactions at the University of Reading, UK. Her research interests encompass the effects of air pollution on climate and the impacts of aviation on the climate.
Source: www.sciencefocus.com
