26. 6 th Extinction? “ The current extinction rate is between 1,000 and 10,000 times higher than the natural rate.” (International Union for Conservation of Nature, IUCN)
27. 6 th Extinction? “ The current extinction rate is between 1,000 and 10,000 times higher than the natural rate.” (International Union for Conservation of Nature, IUCN) Wikipedia
28. 6 th Extinction? “ The current extinction rate is between 1,000 and 10,000 times higher than the natural rate.” (International Union for Conservation of Nature, IUCN) Not a number from science: We don’t really know
29. 6 th Extinction? Mammals, have an average species "lifespan" from origination to extinction of about 1 million years. !
30. 6 th Extinction? Mammals, have an average species "lifespan" from origination to extinction of about 1 million years. So: 5,000 mammal species extant: in the last 400 years, predict ~2 extinctions. !
31. 6 th Extinction? Mammals, have an average species "lifespan" from origination to extinction of about 1 million years. So: 5,000 mammal species extant: in the last 400 years, predict ~2 extinctions. Actually had 89; ~50 times background. !