April 3, 2014
Average annual temperatures in the Southwest grew fastest in Arizona over the 20th century, according to the National Park Service, where some parts of the state saw an average annual increase as high as 7 degrees Fahrenheit. (Map courtesy Patrick Gonzalez/National Park Service)
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More dead trees and the higher temperatures that come as a result of carbon emissions are contributing to an increased long-term risk of wildfires in the Southwest, a panel of climate experts said Wednesday.