Extreme Global Warming May Have Cause Previous Mass Extinction

From MNN:

"We may have found the hottest time the world has ever had," researcher Paul Wignall, a geologist at the University of Leeds in England, told LiveScience. The mass extinction at the end of the Permian Era about 250 million years ago was the greatest die-off in Earth's history. The cataclysm killed as much as 95 percent of the planet's species. One key factor behind this disaster was probably catastrophic volcanic activity in what is now Siberia that spewed out as much as