Firefighers at the Poomacha, Calif., Fire in 2007. (IMAGE)
Caption
In an analysis of 20 years of wildfire records led by researchers at UMass Amherst and the University of Colorado-Boulder, they found human-started fires accounted for 84 percent of all wildfires, exhibiting 'a remarkable influence' on modern US wildfire regimes. Further, humans are expanding the fire niche into more locations and environments with historically low lightning-strike density.
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Public domain. FEMA/Andrea Booher
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