FILE - In this undated file photo provided by the U.S. Forest Service, the Rim Fire burns near Yosemite National Park, Calif. Researchers based at UC Davis’ Tahoe Environmental Research Center, the University of Nevada, Reno and three other universities began working as the Rim Fire was still smoldering last summer. The effort was to gauge how the massive blaze affected water clarity, algae nutrients, light transmission and the aquatic food web at lakes close to the flames and others downwind that were smoked out for weeks. (AP Photo/U.S. Forest Service, File)
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