As I was saying, somewhere, to someone the other day, – oh, I reemember, it was to Timmy – you can get rid of some of the problems with future projections by drawing temperature against CO2 emissions, instead of against time. If you do that, you (the person drawing the figure) doesn’t have to prejudge the separate issue of future CO2 emissions – you can just let your reader decide that for themselves, and then read temperature changes corresponding to CO2 off the chart.
I’m glad to see that the IPCC have been paying attention to my private conversations, and have included figure 10. David Hone is very keen on it too. The RCPs closely overlay each other. Note that the 1% CO2 line and its grey-blue shading is rather misleading: its lower than the rest because, as the IPCC sayeth, “the 1% per year CO2 simulations exhibit lower warming than those driven by RCPs, which include additional non-CO2 drivers”. I’d have omitted it if I was drawing the pic.