America’s Least Wanted: Alien Species Invasions of U.S. Ecosystems

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An invasion is under way that is undermining our nation’s economy and endangering our most precious natural treasures. The intruders are alien species—non-native plants and animals introduced into this country either intentionally or by accident. Attention to the problem of alien, or exotic, species often centers on their costs to agriculture, ranching, forestry, and industry. The price they exact on the nation’s forests, grasslands, and waterways, however, is at least as great.

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