Humanity is in a period exactly like 1938-9, he explains, when "we all knew something terrible was going to happen, but didn't know what to do about it". But once the second world war was under way, "everyone got excited, they loved the things they could do, it was one long holiday ... so when I think of the impending crisis now, I think in those terms. A sense of purpose - that's what people want."
"There have been seven disasters since humans came on the earth, very similar to the one that's just about to happen. I think these events keep separating the wheat from the chaff. And eventually we'll have a human on the planet that really does understand it and can live with it properly. That's the source of my optimism."
"Enjoy life while you can. Because if you're lucky it's going to be 20 years ..."
James Lovelock, The Guardian