"This is a deeply depressing paper. President Bush risks having the biggest impact on wildlife since the meteorite that wiped out the dinosaurs.
The nature paper referenced by the above essay is available for free: Feeling the heat: climate change and biodiversity loss
abstract: Many plant and animal species are unlikely to survive climate change. New analyses suggest that 15–37% of a sample of 1,103 land plants and animals would eventually become extinct as a result of climate changes expected by 2050. For some of these species there will no longer be anywhere suitable to live. Others will be unable to reach places where the climate is suitable. A rapid shift to technologies that do not produce greenhouse gases, combined with carbon sequestration, could save 15–20% of species from extinction. The cover shows a species in the firing line. Boyd's forest dragon, Hypsilurus boydii, is found in Queensland, Australia. About 90% of its distribution would become climatically unsuitable by 2050, on maximum climate warming scenarios. (Photo: Stephen E. Williams)