Tiny natural ponds pose an overlooked danger for speeding up global warming, according to a study published Monday in the journal Nature Climate Change. In experiments designed to simulate moderate future warming, scientists in Britain found that such ponds -- a metre (three feet) across -- gradually lose the capacity to soak up one kind of greenhouse gas and give off even more of another. After seven years at higher-than-ambient temperatures, "the ability of the ponds to absorb carbon dioxide was reduced by almost half, while methane release nearly doubled," said lead-author Gabriel Yvon-Durocher, a professor at the University of Exeter.
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