Humans on Verge of Causing 6th Great Mass Extinction (LiveScience.com)

LiveScience.com - Are humans causing a mass extinction on the magnitude of the one that killed the dinosaurs?

Source: http://us.rd.yahoo.com/dailynews/rss/environment/*http://news.yahoo.com/s/livescience/20110304/sc_livescience/humansonvergeofcausing6thgreatmassextinction

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