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Scientists: Trapped Arctic Methane an Invisible Time Bomb

European scientists say thawing Arctic shorelines could trigger a release of methane gas that would be devastating to the world's climate and economy. They are calling the situation an "invisible time bomb."

The scientists' report, in the journal Nature, says the cost to the world economy would be $60 trillion.

Billions of tons of methane has been trapped under the Arctic ice for thousands of years. But the scientists say it could leak out amid warming global temperatures due in part to the greenhouse gas effect.

Their report says methane gas is about 20 times more effective in trapping the sun's heat than carbon dioxide. The scientists say a massive release of methane from the Arctic could trigger coastal floods, drought, severe storms, and extreme heat.

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US Secretary of State John Kerry (L) gestures waiting for the opening of a plenary session with P5+1 ministers, European Union and Iranian minister on Iran nuclear talks at the Beau Rivage Palace Hotel in Lausanne, Switzerland, March 31, 2015.

Multimedia Iran Nuclear Talks Extended to Wednesday

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