Forests could flip from sink to source of CO2: study
A view of a lowland rainforest on Sumatra, Indonesia. Forests that today soak up a quarter of carbon
Forests that today soak up a quarter of carbon pollution spewed into the atmosphere could soon become a net source of CO2 if Earth's surface warms by another two degrees Celsius (3.6 degrees Fahrenheit), cautions a report to be presented Friday at the UN.
Plants both absorb and exhale carbon dioxide, but healthy forests -- especially those in the tropics -- take up far more of the greenhouse gas than they give off.
When they are damaged, get sick or die, that stored carbon is released.
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