Underwater volcanoes, in the area that is now South Africa, vented roughly 20,500 gigatons of carbon dioxide into the ocean-atmosphere system roughly 183 million years ago, crippling the oxygen cycle.
Underwater volcanoes, in the area that is now South Africa, vented roughly 20,500 gigatons of carbon dioxide into the ocean-atmosphere system roughly 183 million years ago, crippling the oxygen cycle.