What's Driving Longer Wildfire Seasons In The U.S.?

Fire season normally follows the heat of the summer, but now it's stretching nearly year-round.

Wildfires are raging in the West, burning more than a million and a half acres and counting. 20,000 firefighters and emergency crews are battling the blazes. Fire season normally follows the heat of the summer, but now it's stretching nearly year-round. Fires start months earlier, changing what we thought we knew. We start about 90 percent of all wildfires, either accidentally, like when an electric line falls and ignites a tree, or carelessly, when someone throws out a cigarette butt or leaves a campfire burning. And some do it on purpose: arson.