A 1938 photograph shows ponderosa pines in Arizona's Gus Pearson Natural Area (left). Recent monitoring of trees, such as that done from a gondola over a research plot in the Gifford Pinchot National Forest in Washington state (right), shows that the rate at which trees in U.S. and Canadian forests have been dying has doubled over the past 50 years; that rate is independent of tree deaths from catastrophic events.
Credit: IMAGE CREDITS: Courtesy of P. van Mantgem; Univ. of Washington
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