Isn't That Crazy?

In 2007 Bjorn Lombork published a new book, Cool It, in which he explicitly accepted the reality of human caused climate change. This was seen by many as an abrupt reversal of his previous attitude. He insists that he long ago accepted the cost of damage would be between two and three percent of world wealth by the end of the century. The Stern report estimated it would take between five and 20 percent of global GDP to effectively fight climate change.