America's Greenest City Is ...
Portland, according to an event-finding app
By Neal Colgrass,  Newser Staff
Posted Apr 6, 2013 4:10 PM CDT
An aerial tram in Portland, Oregon.   (Shutterstock)

(Newser) – You can measure the green-friendliness of a city in many ways—like its average carbon footprint per citizen or the energy efficiency of buildings. But the event-finding app Gravy has decided to measure cities by the number of pro-environmental events each one hosts in a year, the Huffington Post reports. Is this an official barometer? Hardly, but it does reflect people's interest in the green movement. Here are the top five US cities, each with a unique Earth Day activity:

  • Portland: Operation Clean Street
  • San Francisco: Earth Day SF
  • Boston: Earth Day Massive Spin Jam
  • Austin: Annual Earth Day Festival
  • Chicago: Chicago Earth Day 5K
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