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Tom Coleman, who manages more than 8,000 acres of pistachio trees across California, is worried that warmer temperatures will affect his crops. Ezra David Romero/Valley Public Radio hide caption

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Ezra David Romero/Valley Public Radio

Stands of dead hemlock trees can be seen at Great Smoky Mountains National Park in Tennessee. Mike Belleme for NPR hide caption

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Mike Belleme for NPR

To Tame A 'Wave' Of Invasive Bugs, Park Service Introduces Predator Beetles

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