Burn natural gas and it warms your house. But let it leak, from fracked wells or the melting Arctic, and it warms the whole planet.

Methane is bubbling from lakes all over the warming Arctic.

Methane is bubbling from lakes all over the warming Arctic. Here ecologist Katey Walter Anthony (at right) ignites a large bubble that was trapped by the fall freeze—then freed by an ice pick.

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Picture by Mark Thiessen