http://edition.cnn.com/2016/10/27/opinions/sutter-wwf-sixth-extinction By John D. Sutter, CNN Updated 2304 GMT (0704 HKT) October 27, 2016 (CNN)The Earth’s next mass extinction — the first caused by people — is on the horizon. And the consequences are almost unthinkably dire: Three-quarters of species … Continue reading We have 20 years — at the very most — to prevent mass extinction