The walking dead

The fifth and most recent mass extinction was caused by a giant asteroid. The cause of the sixth extinction is a single species: us.

USDA Photo and courtesy Freshwaters Illustrated: Dave Herasimtschuk
Southern Appalachian Brook Trout need clean, cold water and shade that healthy forests provide.
Gwynne Dyer
Published: Wednesday, 06/24/2015 12:00 am EDT
Last Updated: Wednesday, 06/24/2015 12:00 am EDT

“There are examples of species all over the world that are essentially the walking dead,” said Stanford University professor Paul Ehrlich. “We are sawing off the limb that we are sitting on.”

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