Guardian: As a lead author of the last IPCC report, I find it gratifying that Bjørn Lomborg sings the praise of the “careful work” of the “hugely respected” IPCC. However, Lomborg misrepresents what we wrote in the report. It did not conclude that sea level will stay within the bounds of 18-59 cm by 2100. Rather, effects of sliding ice will come on top of this, which are too hard to predict to give an upper limit. So the IPCC forecast is 18-59 cm plus an unknown extra rise. The IPCC report also …