BBC: "Arctic methane 'time bomb' could have huge economic costs"

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"Scientists say that the release of large amounts of methane from thawing permafrost in the Arctic could have huge economic impacts for the world.

"The researchers estimate that the climate effects of the release of this gas could cost $60 trillion (£39 trillion), roughly the size of the global economy in 2012.

"... In this study, the researchers have attempted to put an economic price on the climate damage that these emissions of methane could cause. Methane is a powerful greenhouse gas, even though it lasts less than a decade in the atmosphere."