Kevin Anchukaitis and Angela Allen, Lamont-Doherty Earth Observatory (IMAGE)

Columbia Climate School

Kevin Anchukaitis and Angela Allen, Lamont-Doherty Earth Observatory

Caption

Researchers have traveled to the Alaskan treeline repeatedly. Lamont tree-ring scientist Kevin Anchukaitis (left) and Fairbanks arctic ecologist Angela Allen sample a dead spruce.

Credit

Lamont-Doherty.

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