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Climate shift 'killing US trees'

Old growth trees in western parts of the US are probably being killed as a result of regional changes to the climate, a study has suggested. Analysis of undisturbed forests shows that the trees' mortality rate has doubled since 1955. The loss of old growth trees could have implications for the areas' ecology and for the amount of carbon that the forests could store. "The trend we're seeing is a prelude to bigger, more abrupt changes to our forests."

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