I think methane hydrates had a lot to do with it: http://www.amazon.com/When-Life-Nearly-Died-Extinction/dp/050028573X http://www.amazon.com/When-Life-Nearly-Di

I think methane hydrates had a lot to do with it: http://www.amazon.com/When-Life-Nearly-Died-Extinction/dp/050028573X http://www.amazon.com/When-Life-Nearly-Died-Extinction/dp/05...