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Frankly, anyone who cares deeply about protecting the environment and the national parks owes a great debt to Joseph Grinnell and his students. Why? Because recent surveys of Yosemite have turned up some troubling results. It seems that nearly all species used to living in cold weather through evolution have moved to ever higher elevations. For scientists, the unquestioned culprit in this developing potential tragedy is global warming. For creatures adapted to the highest elevations there is an even greater sense of urgency because there is no place higher to go!!… More>>
