Global Warming and the Permian Extinction

Continuing with my recent spate of jeremiads:

Global Warming Led To Atmospheric Hydrogen Sulfide And Permian Extinction

Washington, D.C. --- Volcanic eruptions in Siberia 251 million years ago
may have started a cascade of events leading to high hydrogen sulfide
levels in the oceans and atmosphere and precipitating the largest mass
extinction in Earth's history, according to a Penn State geoscientist.

"The recent dating of the Siberian trap volcanoes to be contemporaneous
with the end-Permian extinction suggests that they were the trigger for
the environmental events that caused the extinctions," says Lee R. Kump,
professor of geosciences. "But the warming caused by these volcanoes
through carbon dioxide emissions would not be large enough to cause mass
extinctions by itself."

That warming, however, could set off a series of events that led to mass
extinction. During the end-Permian extinction 95 percent of all species
on Earth became extinct, compared to only 75 percent during the K-T when
a large asteroid apparently caused the dinosaurs to disappear.

http://www.sciencedaily.com/releases/2005/02/050223130549.htm


--dkomo@xxxxxxxx

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