Citations:Permian-Triassic mass extinction


 * 2021, Lucas Joel, Burning Fossil Fuels Helped Drive Earth’s Most Massive Extinction, (6 January 2021);
 * Paleontologists call it the Permian-Triassic mass extinction, but it has another name: “the Great Dying.” It happened about 252 million years ago, and, over the course of just tens of thousands of years, 96 percent of all life in the oceans and, perhaps, roughly 70 percent of all land life vanished forever.