This hillside in north-central Washington was burned in the Okanogan Complex, a massive wildfire that has burned more than 400 square miles and killed three firefighters. It is the largest wildfire in state history, breaking the record set in 2014 by the Carlton Complex. Credit: David Ryder/Reuters

This hillside in north-central Washington was burned in the Okanogan Complex, a massive wildfire that has burned more than 400 square miles and killed three firefighters. It is the largest wildfire in state history, breaking the record set in 2014 by the Carlton Complex.
Credit: David Ryder/Reuters

Temperature hikes driven by global warming have helped make this summer’s wildfire season in North America one for the history books. Now experts are beginning to wonder if Western forests, which evolved over aeons in a cooler, wetter world to coexist with seasonal fire, may be fundamentally changed as a result.

In Alaska, unusually low snow and rain fall over the winter of 2014–15 combined with remarkably hot spring temperatures in excess of […]

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