At this year's Aspen Ideas Festival, we asked a group of journalists, professors, and non-profit leaders to predict the future of livable, walkable cities. "If I could have one wish for people who live in cities," says Conservation International's M. Sanjayan, "it's that we find ways to connect back to nature, to remind [people] that nature isn't out there—outside the cities—but right in their homes where they live." Other panelists include Luís Bettencourt, Geoffrey West, Alissa Walker, Jeff Speck, and Jennifer Pahlka.

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