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Washington State University
College of Arts and Sciences Orrin Pilkey

Exodus: Climate and the movement of the people

footprints sandVast swaths of forests in western North America are dead or dying, killed by pine bark beetle. The beetles have been there all along, but prolonged droughts reduced the trees’ ability to defend themselves from the inner bark-munching bugs.

The western slopes of the Sierra Nevada range in California have been especially hard hit by the depredation, just as people who made money in Silicon Valley sought to move their families out of the choked cities and up into the beautiful mountain forests. Now, to mitigate risk of catastrophic fire and the further spread of pests such as bark beetle, landowners must cut down dying and dead trees—the forests that were the very reason they moved there in the first place. » More …