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."

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.

I do sculpting sometimes when I have the time, and the first thing I sculpted was a bust of [Albert] Einstein. It still sits on my table and still inspires me. He was a person who triggered my imagination and my ideas.

We share this planet, our home, with millions of species. Justice and sustainability both demand that we do not use more resources than we need.

I believe that we will see a lot of destruction, but I believe that if we can see the right patterns and draw the right lessons from that destruction, we might be able to rebuild before it's too late. And then I have that ultimate optimism that even if we can't, life will rebuild itself. In a way, the global economy might collapse, but Gaia won't, and people's ingenuity won't. We will rebuild society, we will rebuild local economies, we will rebuild human aspirations.

We will either defend the rights of people and the earth, and for that we have to dismantle the rights that corporations have assigned to themselves, or corporations will in the next three decades destroy this planet, in terms of human possibilities.

That amazing power of being able to stand with total courage in the face of total power and not be afraid. That is stri shakti.