As the world's cities grow and resources shrink, will we be able to live sustainably with the earth - and with each other? Can we take care of people and the environment? A community watershed project in Sao Paolo, Brazil shows us how. Can urban planning be a win-win for everyone?

This program looks at what sustainability means in locations as diverse as East L.A., Sao Paolo, and Curitiba, Brazil, Vancouver and Portland. Jane Jacobs, Bill McKibben, Bill Rees, California senator Martha Escutia, and John Ryan offer their ideas on what living sustainably in the world's cities means.