"I don't trust humans to look after the planet the way we're going at the moment, no. I think it's going to take a kind of psychic enema to get them concentrating... In my lifetime, everything has become so different. Now, in your lifetime, in my kids' lifetime, it's gonna become different as well. Not just because things happen but because you choose them. And I think the choice has never been more important for humanity because of the huge numbers of people on earth and what we've done to the planet."
"It seems unlikely but this is one of the most peaceful times in human history. Can we make the most of it? "
"Science is enthralling because it's wonderful to find what's happening next in the best of all possible soap operas. You know, you set up this mystery. Where did the universe come from? How do animals think? "
" I think things can be completely transformed in an environmentally sensible way, such that we would live in harmony. You know, our cities would look almost rural. You'd have forests on the roof, you'd have no air-conditioning, you'd have designer buildings which would be living things... that would be naturally green. And I think that is a way forward that's perfectly possible."