Rob Sheldon on the sixth great extinction
and others of note Further to: Is there a sixth great extinction in progress? (It would help if a key exponent was anyone but Paul “Population Bomb” Ehrlich, a contender for the heavyweight champ of wrong-headed predictions), at Evolution News & Views, Rob Sheldon offers While the criteria may sound quantitative, and the increase in extinction rate qualitatively higher, there is a missing factor in this calculation. First, the extinction rate in the past is determined from fossils. Since almost by definition, fossil animals are nearly all extinct today, the extinction rate is close to 100 percent. But the key thing is that not all species are represented in the fossil record. Second, the present extinction rate is determined from Read More ›