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Page added on August 30, 2006

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Global Warming Feedback Loop Caused by Methane, Scientists Say

In the ongoing debate over global warming, climatologists usually peg carbon dioxide as the most dangerous of the atmosphere’s heat- trapping gases.

But methane, a greenhouse gas 20 times more potent than carbon dioxide, might be even more problematic.

According to Tessa Hill, a geologist at the University of California, Davis, more methane is released into the atmosphere from ocean deposits during periods of warming than previously thought.

This expelled methane increases temperatures and releases more methane, creating a positive feedback loop.

The research appeared yesterday in the early online edition of the Proceedings of the National Academy of Sciences.

nationalgeographic



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