Environmentalism has "become a religion" and does not pay enough attention to facts, according to James Lovelock.

The 94 year-old scientist, famous for his Gaia hypothesis that Earth is a self-regulating, single organism, also said that he had been too certain about the rate of global warming in his past book, that "it's just as silly to be a [climate] denier as it is to be a believer" and that fracking and nuclear power should power the UK, not renewable sources such as windfarms.

Speaking to the Guardian for an interview ahead of a landmark UN climate science report on Monday on the impacts of climate change, Lovelock said of the warnings of climate catastrophe in his 2006 book, Revenge of Gaia: "I was a little too certain in that book. You just can't tell what's going to happen."