Paul Hawken — American Environmentalist born on February 08, 1946,

Paul Hawken is an environmentalist, entrepreneur, and author whose influential writings have shaped corporate sustainability... (wikipedia)

Really, the proper study of economics is fulfilment, not consumption... It doesn't even matter if it's a green product or a green house... It's still consumption. What matters in this world is the fulfilment of people's needs and the fulfilment of their aspirations.
Sustainability, ensuring the future of life on Earth, is an infinite game, the endless expression of generosity on behalf of all.
We're trained to see the world in terms of charismatic organizations and charismatic people. That's who we look to for leadership and change, for transformation. We're awaiting the next J.F.K., the next Martin Luther King, the next Gandhi, the next Nelson Mandela.
Good management is the art of making problems so interesting and their solutions so constructive that everyone wants to get to work and deal with them.
We need to revise our economic thinking to give full value to our natural resources. This revised economics will stabilize both the theory and the practice of free-market capitalism. It will provide business and public policy with a powerful new tool for economic development, profitability, and the promotion of the public good.