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Trees Killed by Acid Rain and Aphids

Photo: After being weakened by acid rain, these spruce and fir trees died at the hands of balsam wooly aphids on Mount Mitchell
A stand of withered red spruce and Fraser fir trees blights a green vista in North Carolina's Mount Mitchell State Park. The trees fell victim to balsam wooly aphids after being weakened by the effects of acid rain.
Photograph by Tina Manley/Alamy

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