Living on Earth: Over the short term, methane is 80 times more powerful as a greenhouse gas than carbon dioxide. The White House has launched plans to control methane emissions from most US sources, but as Living on Earth's Helen Palmer reports, evidence from prehistory suggests methane was a major factor in Earth's largest extinction, and warming projections warn of ballooning emissions in the future.
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CURWOOD: Every so often, a cluster of stories come along around the same time that make you think...