Read it... It's pretty extreme stuff:
"I think it's wrong to assume we'll survive 2 °C of warming: there are already too many people on Earth. At 4 °C we could not survive with even one-tenth of our current population. The reason is we would not find enough food, unless we synthesised it. Because of this, the cull during this century is going to be huge, up to 90 per cent. The number of people remaining at the end of the century will probably be a billion or less."I don't really have enough background to assess this at the moment, and I'm very sure my values differ from his a whole heap, but if this was a marketing ploy, it was effective, because I definitely want to read the book now!