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A pine forest in Siberia burns.
A pine forest in Siberia burns. This fire was ignited as an experiment in 1994 to measure the emissions and ecological effects of high severity burns. Increased warming during recent decades has been accompanied by increasing numbers of enormous wildfires, which have burned millions of hectares in Siberian and Canadian forests.
Credit: Tom Swetnam, Laboratory of Tree-Ring Research, University of Arizona
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Related story: Fire Is an Important and Under-Appreciated Part of Global Climate Change