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Re: mass extinction
I believe the stats that are thrown about by journalists suggest that the
RATE (species per unit of time) of extinction is currently faster than at any
other time. Although exactly how the extinction rate can be determined in the
past, I don't know.
I'd have thought that, given the rapid climate shift at the end of the
Pleistocene, extinction rates would have been relatively swift then. Ice core
studies suggest that the climate swung from glacial to interglacial within a
human lifetime. That's a much greater change in global climate, within a much
shorter time span, than us lowly humans have so far been able to manage.
GIS / Archaeologist http://heretichides.soffiles.com
Melbourne, Australia http://www.geocities.com/dannsdinosaurs