Green districts

"Our definition of a green district is a densely populated and geographically cohesive area that is located within a city and employs technologies and design elements to reduce resource use and pollution. In general, green districts deploy design principles that lead to dense, transit-oriented, mixed-use developments; they also consider using renewable energy sources."

from: http://www.mckinsey.com/business-functions/sustainability-and-resource-productivity/our-insights/building-the-cities-of-the-future-with-green-districts