This is from the Economist‘s special issue this week on climate disruption.

What’s striking is how quickly delay in substantial action takes us from +1.5C to +2C tp +2.5C to +3C, and it’s almost independent of how much we cut, except for the really dramatic pathway, but just about the schedule. Accordingly, wait 10 years and, accordingly, while it may not be “too late”, it’s gonna be both much harder to achieve, and there’ll be hell to pay whatever we do.

In a tangentially related comment, I wrote earlier today elsewhere about:

[how] some high quantile of climate disruption might come true. The basic rationale is statistical: There are, stochastically speaking, many more long tailed distributions than symmetric ones (proof by 1-1 pairing since asymmetry is a free parameter), so an arbitrary error in forecasting can land you in hotter water than you otherwise thought you’d might, Black Swans and all that. … [P]eople [are] planning as if climate sensitivity [is] Gaussian.