“UNEP [this graph] provides a slightly more optimistic assessment of the situation. The authors of this report note that peaking global greenhouse gas emissions near current levels globally by 2020 and then reducing them to less than half of current levels through 2050 has about a 66 percent chance of limiting warming this Century to below 2 C (hitting around 1.8 C by 2100). But this assessment may be rather optimistic considering that we will still hit in the range of 450 ppm CO2 and 550 ppm CO2e by mid Century which would be enough, according to our understanding of paleoclimate sensitivities, to hit between 1.9 and 2.2 C from CO2 warming alone and between 2.5 and 3 C from the total warming effect of all CO2 equivalent gasses.”  robertscribbler.com

GR:  I am drawing attention to this story again because everyone needs to look very closely at its discussion of the projections and the probabilities for our future.