Lomborg's latest book, published by CUP next month, is likely to reignite these passions, because it appears to contradict so much of what he has said before and because he is straying into newly controversial territory. He is advocating that much more attention and money be lavished on climate engineering methods, such as whitening clouds so that they reflect back more of the sun's heat.
Heat is something he is resigned to. When he gives talks, he says, he often meets "people who come up and say: 'I thought I'd hate you.'"
But Lomborg's record on climate change is more nuanced than the stereotype suggests. From the beginning, he has said global warming is happening and is largely caused by humans. However, he has been consistently critical of what he sees as exaggeration of how much this matters, and of policies to tackle the problem. These would achieve too little and cost too much, he argues, meaning the money would be better spent on, say, reducing malaria and HIV/Aids, or extending clean water and sanitation.
Though other argue, he's just shilling another book.