Here is great study was published on www.popsci.com and lists Portland, Oregon as the #1 Greenest City in the US with Eugen coming in close at #5. Great Job Oregonians!

America's 50 Greenest Cities

Want to see a model for successful and rapid environmental action? Don't look to the federal government—check out your own town. Here, our list of the 50 communities that are leading the way. Does yours make the cut?

By Elizabeth Svoboda, with additional reporting by Eric Mika and Saba Berhie Posted

How the Rankings Work:

We used raw data from the U.S. Census Bureau and the National Geographic Society’s Green Guide, which collected survey data and government statistics for American cities of over 100,000 people in more than 30 categories, including air quality, electricity use and transportation habits. We then compiled these statistics into four broad categories, each scored out of either 5 or 10 possible points. The sum of these four scores determines a city’s place in the rankings. Our categories are:

Electricity (E; 10 points): Cities score points for drawing their energy from renewable sources such as wind, solar, biomass and hydroelectric power, as well as for offering incentives for residents to invest in their own power sources, like roof-mounted solar panels.
Transportation (T; 10 points): High scores go to cities whose commuters take public transportation or carpool. Air quality also plays a role.
Green living (G; 5 points): Cities earn points for the number of buildings certified by the U.S. Green Building Council, as well as for devoting area to green space, such as public parks and nature preserves.
Recycling and green perspective (R; 5 points): This measures how comprehensive a city’s recycling program is (if the city collects old electronics, for example) and how important its citizens consider environmental issues.

1. Portland, Ore. 23.1

Electricity: 7.1 Transportation: 6.4 Green Living: 4.8 Recycling/Perspective: 4.8

America’s top green city has it all: Half its power comes from renewable sources, a quarter of the workforce commutes by bike, carpool or public transportation, and it has 35 buildings certified by the U.S. Green Building Council.

2. San Francisco, Calif. 23.0

Electricity: 6.8 Transportation: 8.8 Green Living: 3.5 Recycling/Perspective: 3.9
See how San Francisco turns wasted roof space into power, here.

3. Boston, Mass. 22.7

Electricity: 5.7 Transportation: 8.7 Green Living: 3.4 Recycling/Perspective: 4.9
CASE STUDY: Grass Power
Boston has preliminary plans for a plant that would turn 50,000 tons of fall color into power and fertilizer. The facility would first separate yard clippings into grass and leaves. Anaerobic bacteria feeding on the grass would make enough methane to power at least 1.5 megawatts’ worth of generators, while heat and agitation would hasten the breakdown of leaves and twigs into compost.

4. Oakland, Calif. 22.5

Electricity: 7.0 Transportation: 7.5 Green Living: 3.1 Recycling/Perspective: 4.9
See how Oakland's hydrogen-powered transit helps the city cut pollution, here.

5. Eugene, Ore. 22.4

Electricity: 10.0 Transportation: 4.7 Green Living: 2.9 Recycling/Perspective: 4.8
CATEGORY LEADER: Electricity
Much of the wet Pacific Northwest draws its energy from hydroelectric dams. But Eugene draws an additional 9 percent of its municipal electricity from wind farms. It also buys back excess power from residents who install solar panel