New research finds human-caused climate change is now a key driver of forest fire activity in the western United States. Human-caused climate change caused over half of the documented increases in fuel aridity since the 1970s and doubled the cumulative forest fire area since 1984.

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New research finds human-caused climate change is now a key driver of forest fire activity in the western United States. Human-caused climate change caused over half of the documented increases in fuel aridity since the 1970s and doubled the cumulative forest fire area since 1984.