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Thawing Arctic permafrost could release huge amounts of mercury

According to a new study published this month, there may be more than 15 million gallons of toxic mercury buried in the permafrost of the Northern Hemisphere. As the permafrost melts, all that mercury will be released.

Canada's Mackenzie River Basin releasing methane gas

Frozen Arctic permafrost has acted like a tight-fitting stopper, keeping huge quantities of heat-trapping methane gas stored in layers of gas and oil buried deep beneath this barrier for millennia. Global warming has changed all that.

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