Where should green planning efforts come from?

Hundreds of urban planners, architects, developers, environmentalists, entrepreneurs and policymakers danced around this question last week as they convened on Portland for the second annual Ecodistricts Summit.

Hosted by the Portland Sustainability Institute (PoSI), the event complements a maturing experiment to make five of the Oregon metropolis's neighborhoods into "Ecodistricts," neighborhoods designed to be more sustainable.