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Some trees face 'extinction' threat

from CBS News

North America is at a crossroads when it comes to the future of its forests. Several new and devastating tree diseases are moving across the continent and, thanks to globalization, are also starting to crop up elsewhere around the world. Forestry experts in Colorado this month warned that Thousand Cankers Disease continues to spread in the state. The disease, which is transmitted by a beetle that carries a toxic fungus, seems to have originated in walnut trees in the southwestern U.S. and in northern Mexico. more


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