The Thorny Economics of Preventing Exotic Species Introductions

What if we lose tree species we know, love, and need? It has happened before. “Look at what happened to the American chestnut,” says U.S. Forest Service research forester Thomas Holmes. “Look at what’s happening right now to hemlock, redbay, and ash trees.” All three species, as well as many more, are threatened by non-native insects or pathogens. Non-native insects,...

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