British climate researchers Kevin Anderson and Alice Bows, in two highly regarded studies, pose the need for global carbon emissions to peak before 2020. Thereafter, emissions would need to fall, and keep falling, at rates never approached except briefly during the crashes that initiate major capitalist crises. Full decarbonisation of the global economy would occur soon after 2050. Even this scenario, the best the scientists can realistically offer, would see average global temperatures stabilise eventually around 3ºC above nineteenth-century levels – an outcome itself quite likely catastrophic. This prognosis, moreover, rests exclusively on so-called “fast” climate forcings, taking no account of additional warming from “slow” forcings, such as methane releases from melting Arctic permafrost, that are less well quantified.