From your link: "The trigger for these mass extinctions appears to be a warming of the ocean caused by a rise of carbon dioxide levels to about 1000 parts per m

From your link: "The trigger for these mass extinctions appears to be a warming of the ocean caused by a rise of carbon dioxide levels to about 1000 parts per million." That is fucking miles away. At the other end, C3 plant life goes extinct if CO2 falls below 250ppm or so? So why don't you alarmists get your knickers in a twist about that "tipping point"?? If we hadn't dug up and put some fossilized carbon back into the carbon cycle (where it bloody well came from in the first place) then we'd be facing that extinction scenario instead.