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A brick building can lose a lot of bricks and still stand. But if you keep pulling out bricks one by one, eventually the building will collapse. So how many species can we destroy before the earth's biosphere is in catastrophic trouble?<BR>
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Ted Moffett<BR>
<A HREF="http://www.msnbc.msn.com/id/6502368/">
http://www.msnbc.msn.com/id/6502368/</A><BR>
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