The role of geo-engineering should, in a world of responsibility, in a world of scientifically enlightened decision making and ecological understanding, it should be zero. There is no role for geo-engeneering. Because what is geoengineering but extending the engineering paradigm?

The system of seeds based on monoculture is wrong and inappropriate. The biodiverse system has produced more food, and biodiversity means that seeds must be in the hands of farmers.

The population explosion is an ecological phenomenon of displacement. Unless we solve that ecological problem of displacing people - to build huge dams, to build motorways, to take away what people need in order to survive - we will keep pumping more and more money into population programs. We will have more and more coercive and violent methods through which women's bodies are treated as experimental grounds for new contraceptives. Yet we will not have a solution to the problem of numbers.

When you take the entire system into account, ways of developing more of something in one dimension can actually create scarcities in another. If we say we have to increase production because people need more food, more housing, more meat, or more milk, we can make one thing grow in a certain way. But by doing that we create externalities so that there are scarcities in other related things.

We've moved from wisdom to knowledge, and now we're moving from knowledge to information, and that information is so partial – that we're creating incomplete human beings.

Seed is not just the source of life. It is the very foundation of our being.

I didn't leave physics because of boredom. I left it because other issues compelled me in a bigger way. And I always say to myself, "When I'm 60, I'd like to go back to what I interrupted."