Treehugger has compiled a nice list of their favorite “7 Hidden Eco-Gems” – below-the-radar cities that stand out for their sustainable urban development and effectiveness as emerging ‘greening cities'. They're quick to admit their ranking was subjective, but they did take into account these elements in deciding whether or not a city was truly ‘greening' (no city, in their opinion, has earned the title of being really ‘Green'):

Good streets for bike and pedestrian traffic Robust transit Lots of green canopy Expanding and connecting of open spaces Natural storm water management techniques Renewable energy for metropolitan power generation

Their Top 7:

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