Actual (up to 2010) and projected annual rates of emission of CO2 from energy and major industrial sources from 1990 to 2100. The heavy lines are summary representations for four emissions scenarios. Top to bottom these are the reference case of no emissions mitigation policy in place; no mitigation policy up to 2030, then a 2% per year reduction in emissions; implementation of only the current voluntary pledges through 2030, continued unchanged to 2100 (curve labeled INDCs); and the current voluntary pledges to 2030, then mitigation by at least 5% per year to 2100. The individual thin lines are actual modeling runs repeated many times.
Source: Fawcett and coworkers, Science, 2015, Vol. 350, pp. 1168-1169; http://science.sciencemag.org/content/sci/350/6265/1168.full.pdf .
© 2015 Henry Auer