The big ecological changes are really beginning ... in the West. We're seeing some of the effects already — massive forest die-offs, outbreaks of severe forest fires. Whatever affects the watershed is potentially devastating.

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But it's tied to extraordinarily warm temperatures in that part of Canada, not drought. That's like all the forested area of New Mexico, Arizona and Colorado combined.

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We're seeing some of the effects already - massive forest die-offs, outbreaks of severe forest fires. Whatever affects the watershed is potentially devastating.

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