The Hadley Centre has come out with a projection of global warming by the year 2100 under 4 different scenarios. Under the no emissions cuts scenario, the planet warms 5.5-7 deg C by 2100.
"This would lead to significant risks of severe and irreversible impacts."
What surprised me is their conclusion that if we managed a 47% decrease in emissions by 2050 (as compared to 1990 levels), the planet would only warm 2-3 deg C.
I would have expected a larger degree of warming under a 50% emissions cuts scenario.
What are your thoughts?