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The lands in the arctic circle have been frozen for thousands and sometimes even hundreds of thousands of years. Photo: NASA.

When the ground disappears under your feet

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Thawing frozen soil witness in Alaska. Source: NPS Climate Change Response.

As the Earth warms, there is increasing concern about the return of frozen diseases

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A particularly hot summer in Alaska in 2004 caused the collapse of the permafrost seen in the photograph. Source: NPS Climate Change Response.

Thawing the ice freeze could accelerate global warming

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