The world four degrees hotter? An unwelcome idea

Extract:
"A quarter of the planet's mammals are on a downward spiral toward extinction.
"A 4.0 C increase in global mean temperatures has the potential to threaten human security and quality of life in a manner unprecedented in recent history," says Arizona State University professor Pamela McElwee.
Francois Gemmene, a researcher at France's Institute for Sustainable Development and International Relations (IDDRI), adds: "At 4.0 C, climate-driven migration redraws the map of population distribution across the surface of the globe."

>> See the article on France 24 website