That many forests in the United States are suffering health crises is not in question. Much of this troubling condition, however, has come as a result of human activities. The global trade in wood chips, raw logs and live trees has imported invasive plants, disease and insects. Over-logging and soil compaction make natural forest regeneration difficult. And acid rain from Midwest smokestacks kills off the mountaintop forests of the Northeast.
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Photo credit: American Chestnut Foundation
