The number and size of large forest fires in the West have grown "suddenly and dramatically" in the past two decades in part because of global warming, a study released Thursday says.
The scientific paper, posted online by the journal Science, says wildfire season in Western states has grown up to 2½ months longer since 1987 because of warmer spring temperatures and earlier, faster melting of mountain snow. The timing of that annual snowmelt, a key source of the West's water, also helps gauge the severity of wildfire season.
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