[At 4C] Agricultural collapse pressure is very high. A number of regions including Europe, the U.S. West, China, large parts of Africa, India and many more are all likely to be well outside of growing temperature ranges at this time. Loss of 500 billion Tons of carbon from the Arctic at 4 C over 500 years is probably possible at this time. Total annual carbon feedback is probably edging into a range of 1.5 billion tons per year from the Earth System. Continue reading →