Tuesday August 14, 2018

Scientists may have found an upside to Air Pollution: Study

two pollutants coming out of the smokestacks at coal-fired power plants interact to make a kind of fertilizer for ocean-dwelling plankton

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FILE - Smoke billows from chimneys of the cooling towers of a coal-fired power plant in Dadong, Shanxi province, China. VOA
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US, Mar 3, 2017: Scientists may have found an upside to air pollution.

A new study found that two pollutants coming out of the smokestacks at coal-fired power plants interact to make a kind of fertilizer for ocean-dwelling plankton. That may help increase how much planet-warming carbon dioxide the plankton absorb.

The authors didn’t study the size of the fertilizer effect. But given the amount of coal burning going on, especially in Asia, they say it could be modest but significant.

While coal pollution is a major contributor to climate change and harms human health, “in this case it is doing us a good thing,” said University of Birmingham environmental scientist Zongbo Shi, senior author of the study.

“Earth systems are sometimes very complicated,” he added. “They are doing things that we don’t really expect.”

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Sulfate coating

Iron is essential for plant growth. But the mineral is often in short supply in ocean ecosystems.

Burning coal releases iron particles. Some estimates say the amount of iron falling into the oceans may have doubled or tripled since the Industrial Revolution.

But when that iron leaves the smokestack, it is locked away in a chemical form that’s not useful to plants.

Shi and colleagues found that as airborne particles drift along with other smokestack pollutants, they acquire a coating of sulfate, a chemical responsible for acid rain. That acidic coating triggers a reaction that generates iron sulfate, a soluble form of the mineral that plants can use.

The research was published in the journal Science Advances.

FILE - Power plant chimneys stand behind a coal-burning neighborhood covered in a thick haze on the outskirts of Ulaanbaatar, Mongolia, Jan. 19, 2017.
FILE – Power plant chimneys stand behind a coal-burning neighborhood covered in a thick haze on the outskirts of Ulaanbaatar, Mongolia, Jan. 19, 2017. VOA

Amount of absorption

The study “provides a demonstration of something that we thought was occurring, but couldn’t necessarily demonstrate,” said University of California-Davis engineering professor Chris Cappa, who was not involved with the research. But it’s still not clear how much is occurring, he said.

Burning less coal will still mean fewer greenhouse gas emissions. But Shi said the reduction might be less than anticipated.

“If we control air pollution, then all this potential uptake of carbon dioxide by the ocean will become less and less,” he said. “Then we will have to cut more and more greenhouse gas emissions.”

But outside experts cautioned that it would take more work to figure out what effect these air pollution particles actually have on how much carbon dioxide plankton absorbs.

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‘Nuanced’ relationship

“The link between iron fertilization and carbon dioxide storage is more nuanced,” said marine chemist Scott Doney at the Woods Hole Oceanographic Institution in Woods Hole, Massachusetts. “There was a period of time when people talked about deliberately fertilizing the ocean with iron as a route to carbon storage. And it turns out not to be so simple.”

Before people get too excited about the benefits of air pollution, they should know this: The same form of iron that plants find useful also triggers damaging chemical reactions in human lungs, Shi said. That may be responsible for some of air pollution’s impact on health.

“It is not a simple good or bad,” he said. (VOA)

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Brazil Cut Its Greenhouse Gas Emission Levels Lower Than 2020 Emission Goals

The 2020 emission goals were set out in the 2009 Copenhagen Accord to combat climate change. Under the more ambitious Paris Agreement in 2015 on climate change, Brazil has set goals for further steep cuts in greenhouse gas emissions for 2025 and 2030.

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Brazil Surpasses 2020 Target to Cut Deforestation Emissions. Flickr Commons

Brazil cut its greenhouse gas emissions from deforestation in 2017 to levels below its internationally agreed 2020 climate change targets, the country’s Environment Ministry said Thursday.

Brazil reduced its emission from deforestation in the Amazon rainforest by 610 million tons of carbon dioxide (CO2), compared to its 2020 target of 564 million tons. In the Cerrado savanna, emissions were reduced 170 million tons of carbon dioxide versus a target of 104 million tons.

The Amazon, the world’s largest tropical rainforest, and the Cerrado, South America’s biggest savanna, soak up vast amounts of carbon dioxide, and their preservation is seen as vital to the fight against climate change.

Brazil reduced its emission from deforestation in the Amazon rainforest. Pixabay
Brazil reduced its emission from deforestation in the Amazon rainforest. Pixabay

But destruction of the forest releases large quantities of CO2, one of the main greenhouse gas emissions that cause global warming. Large-scale Amazon deforestation has made Brazil one of the world’s top greenhouse gas emitters, because of fires and the spread of agriculture and cattle ranching.

The 2020 emission goals were set out in the 2009 Copenhagen Accord to combat climate change. Under the more ambitious Paris Agreement in 2015 on climate change, Brazil has set goals for further steep cuts in greenhouse gas emissions for 2025 and 2030.

Also Read: Nature in Danger: Deforestation Climbs High

“The policy message is that we can and should remain in the Paris Agreement (because) it is possible to effectively implement the commitments that have been made,” said Thiago Mendes, secretary of climate change in the Environment Ministry. (VOA)