Doubling Of CO2 Levels In End-Triassic Extinction Killed Off Three Quarters Of Land And Sea Species | ThinkProgress
There are very strong indications that the current rate of species extinctions far exceeds anything in the fossil record. Thats from a 2010 special issue on climate change and biodiversity from the UKs Royal Society.
In 2011, a Nature Geoscience study found humans are spewing carbon into the atmosphere 10 times faster now than 56 million years ago, the Paleocene-Eocene Thermal Maximum (PETM), a time of 10°F warming and mass extinction.
An even more ancient extinction is the subject of a new study in Science (subs. reqd), with the tongue-twister title, Zircon U-Pb Geochronology Links the End-Triassic Extinction with the Central Atlantic Magmatic Province.
As the MIT News release puts it:
Some 200 million years ago, an increase in atmospheric CO2 caused acidification of the oceans and global warming that killed off 76 percent of marine and terrestrial species on Earth.