Humans on Verge of Causing 6th Great Mass Extinction

Posted by Live Science: Stephanie Pappas on March 2nd, 2011
Live Science: Are humans causing a mass extinction on the magnitude of the one that killed the dinosaurs? The answer is yes, according to a new analysis — but we still have some time to stop it. Mass extinctions include events in which 75 percent of the species on Earth disappear within a geologically short time period, usually on the order of a few hundred thousand to a couple million years. It's happened only five times before in the past 540 million years of multicellular life on Earth. (The last great......

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