Climate Discovery: Very Large Negative Emissions: Beyond Paris Emissions Reductions to a Safe and Healthy Climate

„James Hansen, 32 year director of the U.S. national climate modeling agency, the NASA Goddard Institute for Space Studies (1981-2013, now retired), has had a new fundamental piece of climate work published. His team looks at the negative emissions required–in addition to various scenarios for emissions reductions–that are needed to achieve “non-dangerous” warming. Under Hansen’s scenarios, to limit warming to 1.3 or 1.4 C maximum, and have the temperature fall back to about 1 C by the end of the century, we need to remove 7 to 32 gigatons of CO2 directly from the sky every year until 2100–in addition to 80 percent emissions reductions by 2050 and 100 percent by 2080. We emit nearly 40 Gt CO2 annually today.“