evidence: Mr. Hallam’s claim that "the science predicts" that six billion people are headed for slaughter and starvation by 2100 is simply not correct. No mainstream prediction indicates anywhere near this level of climate-change-induced human mortality, for any reason. The effects of war, disease, and weather disasters are somewhat harder to anticipate (and outside of my core expertise), so I will focus the remainder of my reply on food supply issues. [...] While I don’t agree that "science predicts" the death of six billion people, in my opinion Hallam’s broader warning has qualitative merit and in the context of a lay translation of risk his use of "six billion" might reasonably be interpreted as figurative, an illustration of a worst-case scenario (again, that I don’t think can be ruled out). Whether to interpret this claim literally or figuratively is a question perhaps best left to humanists. Given this ambiguity I judge it "unrateable." [...] I know of no climate model simulation or analysis in the quality peer-reviewed literature that provides any indication that there is a substantially non-zero probability of "starvation of 6 billion people this century" as a result of climate change.