Extreme heat may trigger human-mammal mass extinction sooner than thought
This event would mark the first mass extinction of a magnitude comparable to the era of the dinosaurs.
Animated image shows average monthly surface air temperatures (degrees Celsius) for Earth in 250 million years in the future when all the continents merge to form the next supercontinent (Pangea Ultima) where temperatures will be much hotter than today. (photo credit: University of Bristol)Updated: 
