Given what we know now, there is almost no way that the feared large temperature rise is going to happen. Mr. Lewis comments: “Taking the IPCC scenario that assumes a doubling of CO2, plus the equivalent of another 30% rise from other greenhouse gases by 2100, we are likely to experience a further rise of no more than 1°C.”
A cumulative change of less than 2°C by the end of this century will do no net harm. It will actually do net good — that much the IPCC scientists have already agreed upon in the last IPCC report. Rainfall will increase slightly, growing seasons will lengthen, Greenland’s ice cap will melt only very slowly, and so on.