I think it's great that we have organisations like Greenpeace. In a pluralistic society, we want to have people who point out all the problems that the Earth could encounter. But we need to understand that they are not presenting a full and rounded view.

Even if I was a bad right wing guy, to the extent of whether my arguments are right or wrong, they're right or wrong independently if I'm right or left.

A review was published in Nature, very scathing, essentially calling me incompetent, though they didn't use that word. I am putting a reply on my Web site in a few days, where I go through their arguments, paragraph by paragraph.

I really try to say things as they basically are and it so happens that it is a good message that things are getting better, but there are still problems.