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Trees Dying In The Western U.S.

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Trees Dying In The Western U.S.

Trees Dying In The Western U.S.

Trees Dying In The Western U.S.

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Reporting in the journal Science, researchers say trees in the old forests in western America have been dying at greater rates in recent decades. Research ecologist Phillip van Mantgem explains why scientists believe the increase in tree death is linked to climate change.