It’s predicted that 3bn people will live in zones that have been made uninhabitable (black areas) by 2070, say scientists. A third of the world’s population could live in a climate similar to the Sahara in just 50 years, according to a recent study published in PNAS in 2020. That means 3.5bn people could live with average temperatures in the mid-80s, “outside of humanity’s comfort zone” by 2070. In under 50 years large swaths of norther South America, central Africa, India and northern Australia will become too hot to allow human life. And the acceleration of global warming suggests this deadl…