Boost to CO2 mass extinction idea

A computer simulation of the Earth's climate 250 million years ago suggests that global warming triggered the so-called "great dying". A dramatic rise in carbon dioxide caused temperatures to soar to 10 to 30 degrees Celsius higher than today, say US researchers.

The warming had a profound impact on the oceans, cutting off oxygen to the lower depths and extinguishing most lifeforms, they write in the latest issue of Geology.

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