The concept of national sovereignty has been an immutable, indeed sacred, principle of international relations. It is a principle which will yield only slowly and reluctantly to the new imperatives of global environmental cooperation. It is simply not feasible for sovereignty to be exercised unilaterally by individual nation states, however powerful. The global community must be assured of environmental security.

I am retired from all my official roles, but I am still very active. I have close relationships at the U.N. I don't have any role at the U.N, but I'm still quite cooperative with a number of U.N. activities, in particular to China and that region.

We must, from here on in, all go down the same path... There may not be another chance.

Current lifestyles and consumption patterns of the affluent middle class…involving high meat intake, consumption of large amounts of frozen and convenience foods, ownership of motor vehicles, golf courses, small electric appliances, home and work place air-conditioning, and suburban housing are not sustainable...

Occupy World Street is a masterpiece which deserves to get wide circulation and commitment by world leaders.

I am a socialist in ideology, a capitalist in methodology.

The Prime Minister of India, at a meeting that I co-chaired a few months ago, stated that any development that is not sustainable is not development.