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KLAMATH, CA - NOVEMBER 20, 2014: Mist rises after a recent rain along Blue Creek near the Yurok tribe's carbon offset project in Northern California photographed November 20, 2014 near Klamath. The tribe is measuring trees and constructing an inventory to calculate not how many board-feet of timber they can yield, but how much carbon dioxide they can sequester.
Brian van der Brug / Los Angeles Times / Getty Images