Alaska permafrost put at risk by climate change

Researchers are racing to study how fast permafrost is transitioning from carbon sink to source of emissions, with the climate in the balance.

On a blustery day in August, a team of five scientists watched with perverse fascination as saltwater from the Arctic Ocean lapped over the tundra of Alaska’s Prudhoe Bay. They’d spent more than a year studying the phenomenon that’s increasingly common as land ice melts, but had never witnessed it firsthand.

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