Leveling off at 2 degree C rise by 2100 will cost $40 trillion a year
Climate economists are telling us that leveling off at 2 degree Centigrade or 3.6 degrees Fahrenheit, which is what everybody has agreed on, would cost at the end of the century -- and this is the average of all the macroeconomic models, if we do it really smart -- $40 trillion a year.