Earth's Sixth Mass Extinction: Is It Almost Here?

Earth's Sixth Mass Extinction: Is It Almost Here?
Wed, 02 Mar 2011 13:04:00 -0600

With the steep decline in populations of many animal species, scientists have warned that Earth is on the brink of a mass extinction like those that have occurred just five times during the past 540 million years.

Each of these "Big Five" saw three-quarters or more of all animal species go extinct.

In results of a study published in this week's issue of journal Nature, researchers report on an assessment of where mammals and other species stand today in terms ...

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