A possible consequence of even a four- or five-degree temperature rise—on the low end of projections for doubled CO2—is that the world will enter a completely new climate regime, one with which modern humans have no prior experience. Meanwhile [...] It is believed that the last time carbon-dioxide levels were in this range was three and a half million years ago. "It's true that we've had higher CO2 levels before. But, then, of course, we also had dinosaurs."
Sunday, May 01, 2005
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