Study: Earth on track for mass extinction--humans are to blame

http://www.latimes.com/science/sciencenow/la-sci-sn-species-extinction-20150619-story.html

EXCERPT:

...since 1900, mammal species have been disappearing 28 times faster than would have been expected without the influence of humans, according to the study.

The defunct species aren't the only ones that suffer, Barnosky said. From a practical point of view, extinctions could devastate the world's fisheries and destroy the ecosystems humans rely on to filter water, provide food, and get resources.

"There is so much at stake," said Gerardo Ceballos, an ecologist at the National Autonomous University of Mexico and the lead author of the study. "Unless we do something radically different soon, we may end up having a big catastrophic collapse of humans, not only animals."