See related slideshow As humans spread and sprawl across the landscape, other critters are left up a creek without a paddle -- and sometimes even without a creek. In the natural course of things, plant and animal species do go extinct, but not nearly at the clip we're seeing these days. The rate of extinction has been estimated at 1,000-10,000 times what it would be without marauding Homo sapiens, and we're losing roughly 30,000 species a year, or three an hour. The Center for Biological Diversity is one of the few conservation organizations drawing an explicit link between population and …
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