Ever noticed that each day between 8am and noon, everybody dies?: If the Earth gets six degrees warmer, humans will allegedly go extinct

Grasping climate change solutions, with both hands - The Drum Opinion (Australian Broadcasting Corporation)

The harsh reality is in fact that scientists and environmentalists had been hoping to cap warming at two degrees. This now seems almost utopian and has been revised up to four degrees. If it gets beyond even this to six degrees we are looking at mass extinction of many species, including humans.