quote: Ah, but the Devonian event wasn't due to species extinction, but rather a simple decrease in the rate of speciation, stretching over several million years.
quote: though this is not true for the Permian event, in which both species count and biomass decreased
quote: Low origination contributed more than high extinction to the marked loss of diversity in the late Frasnian
quote: Then you'll be pleased to know that the US actually has a higher level of forestation today than it did in the year 1900. Today, more of the US is covered in trees than was 100 years ago.
quote: Historically, atmospheric oxygen has never varied substantially
quote: I see population and deforestation as far more serious threats to producing global warming than industry.