When I find too many puzzles about the way explanations are given about why there is inequality - why people who work the hardest in the world end up being the poorest - I can't just sit back and not try to understand why the gaps between people are increasing, or why there are so many homeless and hungry people in the world.

When the wilderness movement emerged, it emerged separate from the issue of social inequality and the economic problems of survival. It was a preservationist ecology movement created by an occupying culture. Clearly, a wilderness movement started by Native Americans would not have had the same roots.

The environmental movement can only survive if it becomes a justice movement. As a pure environmental movement, it will either die, or it will survive as a corporate 'greenwash'. Anyone who's a sincere environmentalist can't stand that role.

Because of these new car models there is suddenly on the streets of Delhi a new intolerance by the motorists for both the cows and the cyclists. So for the first time the sacred cow in India, which used to be such a wonderful speed-breaker, is now seen as a nuisance. For the first time, I’ve seen cows being hit and hurt. These guys just go right past, and if the cow is sitting on the road, they don’t care. We can’t afford to have a sacred car rather than a sacred cow.

I saw brilliant ideas coming out of the [Chipko] movement that needed better articulation, that needed elaboration and systematic analysis. I just followed that and it's been very exciting.

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 think what we owe each other is a celebration of life and to replace fear and hopelessness with fearlessness and joy.