Global warming makes tropical soils leak CO2: study
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February 04, 2023

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SATURDAY, FEBRUARY 04, 2023
Global warming makes tropical soils leak CO2: study

Climate Change

BSS/AFP
13 August, 2020, 08:25 am
Last modified: 13 August, 2020, 11:46 am

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Global warming makes tropical soils leak CO2: study

The quantity of carbon cycling each year through soils worldwide is up to 10 times greater than human-generated greenhouse gas emissions

BSS/AFP
13 August, 2020, 08:25 am
Last modified: 13 August, 2020, 11:46 am
"Carbon held in tropical soils are more sensitive to warming than previously recognised," says Andrew Nottingham, a researcher at the University of Edinburgh Florence GOISNARD/ AFP
"Carbon held in tropical soils are more sensitive to warming than previously recognised," says Andrew Nottingham, a researcher at the University of Edinburgh Florence GOISNARD/ AFP

Tropical forest soil warmed in experiments to levels consistent with end-of-century temperature projections released 55 percent more CO2 than control plots, exposing a previously underestimated source of greenhouse gas emissions, researchers reported Wednesday.

Before humanity began loading the atmosphere with carbon pollution by burning fossil fuels, the input and outflow of CO2 into soil — one key element in Earth's complex carbon cycle — remained roughly in balance.

Gases emitted by deadwood and decaying leaves, in other words, were cancelled out by microorganisms that feed on such matter.

But climate change has begun to upset that balance, according to a new study, published in Nature.

"Carbon held in tropical soils is more sensitive to warming than previously recognised," lead author Andrew Nottingham, a researcher at the University of Edinburgh's School of Geosciences, told AFP.

"Even a small increase in respiration from tropical forest soils could have a large effect on atmospheric CO2 concentrations, with consequences for global climate."

The quantity of carbon cycling each year through soils worldwide is up to 10 times greater than human-generated greenhouse gas emissions.

Just a one-percent imbalance — with more carbon going out than in — "would equal about ten percent of global anthropogenic (manmade) carbon emissions," noted Eric Davidson, a researcher at the University of Maryland Center for Environmental Science.

Earth's average surface temperature has risen just over one degree Celsius (1C) above preindustrial levels, enough to boost the severity of droughts, heatwaves and superstorms made more destructive by rising seas. 

But the increase in temperatures over land alone — excluding oceans, which cover 70 percent of the planet — has been nearly 2C, or double the global average.

Environment / Top News / World+Biz

Global warming / CO2

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