If you're like me, and spend a lot of the day drinking coffee and getting increasingly paranoid with the creeping suspicion that solving climate may not be possible, it's good when you find glimmers of hope in the wreckage. One of those glimmers (actually more like a tractor beam) is called Energy Trust, an organization in Oregon that, if widely copied, would move us well on the way to solving climate change.

I recently spent a few hours with my friend Greg Stiles, who helps run their business sector programs, and I was blown away by their creativity and success. Here are some tidbits: Energy Trust is funded to the tune of $130 million annually through a public purpose charge on Oregonians' utility bills. That alone is arguably part of a solution to climate change -- it's a price signal on energy costs that will force people to conserve. (By the way -- it's also a sign of things to come, and the program's enormous success puts the lie to the delusional notion that to solve climate we need to make energy cheap (that might happen one day, but first it will have to get expensive. No freebies on this one, techno-optimists.)

Two programs caught my attention. The first is one approach to solar electric installations. Most utilities offer rebates for residential and commercial systems, and that's it. The problem is that these systems, even with good rebates, are still frickin' expensive. (As an example, I'm putting 4.5 kW on my roof, and with three different rebates and a hell of a deal from my installer, I'll see a return on my investment of 6 percent. It's OK for me, but not for most.)

What Energy Trust did is a form of "end-use, least cost" planning, a term Amory Lovins coined. They asked: "What do we want, and what is the cheapest way to get that?" What they wanted was clean energy, in the form of solar on people's roofs. So they brought together everyone interested into a bulk purchase. Then they bid the contract in one huge chunk. Economies of scale enabled everyone to get what they wanted -- their own system, on their own roof -- but at a 25 percent discount. Brilliant, right?

But we aren't going to solve climate change with brilliance, we're going to solve it with applied common sense. The next smart innovation came in the form of lighting retrofits. I've banged my head against this problem for a long time, and if I were to implement a program, I'd do the same dumb thing I always do -- go to the owner of a property and try to convince him or her to upgrade. But that's the wrong approach.

Energy Trust recognized that first, owners don't listen to the random enviro dude. They listen to their contractors. And they know that only electricians have the time or interest to care what a T5 is vs. a T12, and to note the rebates available for a switch.

By reaching out to contractors and electricians with info on the best technology and the rebates available, Energy Trust created a free, motivated sales force, and one that could actually get the retrofits done. Granted, Energy Trust has lots of money to make these improvements happen, and it comes out of customers' pockets. But that's what it's going to take -- a tax.

Remember -- solving climate change is going to hurt. And a few dollars on your utility bill is not the kind of pain I'm talking about. That's a pleasure.

Meanwhile, with that public purpose charge, Energy Trust is achieving the holy grail of energy geeks: they are helping utilities actually meet growing demand with efficiency, not new power. The utilities love it so much they are kicking in more of their own money to fund the program. The customers get disproportionately good service and love that. And I love it because it gives me a massive dose of that heroin-like drug -- hope.

Related: Portland weatherization program gives top billing to labor standards and community benefits

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Clean Energy Works Portland is a groundbreaking new program that enables Portland residents to improve the energy efficiency of their homes and pay for the improvements over time through their utility bills.

A contractor performing a blower door test to identify air infiltration and leakage throughout a home.Energy Trust of OregonBut the most exciting and unique aspect of the program is the Community Workforce Agreement that was developed by representatives of labor unions, community groups, businesses, community colleges, and other stakeholders. It is a comprehensive plan to make sure that new jobs created by Clean Energy Works Portland are high quality, career-track jobs that offer family-supporting wages and benefits, and that they go to local residents from diverse backgrounds.

"We wanted to have this project reflect some higher set of goals beyond just retrofitting homes and reducing carbon emissions," said Derek Smith of Portland's Bureau of Planning and Sustainability, the city's go-to person on the Clean Energy Works Portland program.

The program uses $2.5 million in Energy Efficiency and Conservation Block Grant funds the city received through the American Recovery and Reinvestment Act as seed money to start a revolving loan fund that will enable Portland homeowners to improve the energy efficiency of their homes at no up-front cost. The energy improvements that will be available to homeowners during the pilot phase of the program, which will cover 500 homes, include insulation, air sealing, duct sealing, and improvements to space heating and water heating systems.

The Energy Trust of Oregon will schedule home energy assessments for interested homeowners and help them choose the energy saving options that best meet their needs. To pay for the improvements, homeowners will receive low-interest, long-term loans and will pay them off via their monthly utility bills.

Once the pilot phase is completed next summer, some 100,000 homes in Multnomah County, which encompasses the city of Portland, could qualify for the program.

A state law, Oregon's Energy Efficiency and Sustainable Technology Act of 2009 (HB 2626), made the Portland financing mechanism possible. "Portland is the first pilot project for this new statewide, low-interest loan program for weatherization work that you can pay back on your utility bill. That's how we're going to spread this idea around the state," said Barbara Byrd, who wears many hats in Oregon, including secretary-treasurer of the Oregon AFL-CIO and coordinator of the Oregon Apollo Alliance, which strongly supported passage of HB 2626.

Fifty-five direct jobs will be created by the pilot program, but many more are expected to be created after the pilot phase. In order to make sure those jobs will have good wages and benefits and be accessible to community members with previous barriers to employment, the city pulled together approximately 60 stakeholders to develop a Community Workforce Agreement that would complement Clean Energy Works.

Smith of the Portland Bureau of Planning and Sustainability said he got the idea to bring labor and training standards and community benefits into the program from being part of the Green For All "community of practice." The community of practice connects people throughout the United States who are working on green jobs programs and helps them share their learning experiences with others in the field. Green For All is a partner in Clean Energy Works Portland, along with the Energy Trust of Oregon, Portland General Electric and others.

Maurice Rahming, president of the National Association of Minority Contractors of Oregon, participated in the Clean Energy Works Portland stakeholder meetings that culminated in the Community Workforce Agreement. "I think it's a tribute to the mayor that he got minority contractors involved early on, rather than having them involved at the very tail end. It shows he's looking to diversify the contracting pool," Rahming said.

"Construction isn't always the most diverse workforce that's out there, and we wanted to set up an understanding that let's have the workforce and the contractors reflect the city of Portland," he added.

In addition to minority contractors, the stakeholder meetings included many groups that offer pre-apprenticeship training to prepare people in basic work skills so that they can then enter training programs that teach skills specific to an occupation. These groups included the Native American Youth and Family Center, which offers employment training courses to Native Americans; and Oregon Tradeswomen, which offers women training courses to prepare them to enter the building and construction trades. Pre-apprenticeship training programs like these will funnel participants into weatherization technician training courses linked to Clean Energy Works Portland.

Many labor unions also participated in the development of the Community Workforce Agreement, including the Laborers union, which is about to begin offering training courses in weatherization that will be available to graduates of the pre-apprenticeship programs described above. "A part of what we wanted to see [in the Community Workforce Agreement] was that people were going to get quality training, because then they're going to come into the market with better skills, and that's a chance for them to get their wages up," said Al Davita, the training director of the Laborers Training Program in Oregon and southern Idaho.

Davita said the Laborers will be providing three levels of training in weatherization-an 80-hour entry-level class for weatherization installers/technicians that will require 80 hours in general residential construction to get into the class; a 40-hour weatherization supervisor training; and a 40-hour energy auditor training. This means that trainees who become weatherization technicians through Clean Energy Works Portland will be able to move into other careers with additional training.

"Our plan is to recruit people who are out of work, give them quality training so they can go out and do this work, but also give them a career pathway so that they can potentially stay in weatherization for the next 20 years or may be able to move into commercial building construction or demolition, where the wages are higher. So we're looking to give people the chance to change their lives," Davita said.

After five weeks of meetings, the stakeholders came to consensus on a Community Workforce Agreement for the Clean Energy Works Portland pilot program that lays out requirements for worker training, wages and benefits, local hiring, contractor standards and more. Key goals and targets of the agreement, which was passed by the Portland City Council on September 30, include:

Local hire: at least 80 percent of employees used in the pilot program will be hired from the local workforce.

Family-supporting jobs: workers will earn no less than 180 percent of the state minimum wage.

Diverse workforce: historically disadvantaged or underrepresented people, including people of color, women, and low-income city residents, will perform at least 30 percent of total trades and technical project hours.

Diverse business participation: twenty percent of the dollars that flow through the project will go to businesses owned by historically disadvantaged or underrepresented people.

Prevailing wage: contractors will pay wages that are at least 180 percent of Oregon state minimum wage or the prevailing wage for weatherization work, whichever is higher.

Worker training: contractors will hire 100 percent of new weatherization employees from designated training programs until 50 percent of the contractor's non-supervisory work hours are performed by these training program graduates.

Labor peace: contractors will sign a labor peace agreement that includes a majority sign-up provision (meaning that contractors will respect the will of the workers if a majority of them signs up to form a labor union).

The Community Workforce Agreement also sets up a system of "best value contracting," which means that contractors wishing to join the pool of qualified contractors for the Clean Energy Works Portland program will be scored on a range of attributes. They will earn points for having a successful track record of hiring and retaining historically disadvantaged people; having a plan for establishing sub-contracting relationships with businesses owned by people of color and women; and hiring graduates of pre-apprenticeship training programs, among other criteria.

Clean Energy Works Portland's criteria for qualified training programs requires the programs to have at least three defined partnerships with state recognized pre-apprenticeship programs or signatory community organizations that service underrepresented populations, and to make sure a majority of trainees are women, people of color, low-income people or people from disadvantaged communities.

"In Oregon, a state with one of the highest unemployment rates in the country, Clean Energy Works Portland stands to provide a scalable national model by leveraging federal recovery dollars to put people back to work and achieve significant carbon reductions," said Portland Mayor Sam Adams. "With our community workforce agreement, we have the ability to promote social equity in a measurable way, providing an opportunity for under-employed youth and adults to gain career training in the sustainable building industry, and ensure that Portland stays at the forefront of the green economy."

For other cities that are considering designing programs similar to Portland's, several of the people who participated in the process that created the Community Workforce Agreement emphasized the importance of involving stakeholders early in the process. "My bottom line advice is that if you want to do this, you have to involve the stakeholders from the very beginning of the process," said Barbara Byrd. "It's not something the city can put together and ask people to sign on to. It was the involvement of the stakeholders that not only created the workforce agreement, but will also make sure it works."

Rahming said that the early involvement of minority contractors will help them be able to participate in the program. "In contracting, time is everything," Rahming said. "A lot of times, larger companies can put proposals together more quickly, because they have more staff. This time, because the project was presented to my contractors at the front end, it will allow them to be able to meet the wage and benefits and training requirements."

Now that the Community Workforce Agreement is in place and the pilot program has already begun converting loans for homeowners, some of the same people who were involved in the stakeholder process will oversee how the program is run.

"The side benefit of this whole effort is energizing a community," Smith told Oregon Live in a recent interview. "People are really interested in this. It's good for the economy. It's good for their home energy bills and (the environment). It seems like one of the promises of the new clean economy could be realized here."

For more information about Clean Energy Works Portland, go to www.cleanenergyworksportland.org.

Read the Community Workforce Agreement.

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The cermonial urban-turbine installation.indigo12west.comTwo weeks ago in Portland, Oregon, a new 23-story building added something you don't usually see in an urban setting: a series of four Skystream wind turbines, with a total capacity of 9.6kW.

There are several reasons why wind turbines are a rarity atop highrises -- beyond the obvious one: our power infrastructure makes changing from traditional sources of electricity difficult, expensive, and seemingly unnecessary. (As long as you can convince yourself that the planet isn't really warming and that 15,000 Americans don't die prematurely each year from breathing in filthy air from coal-fired power plants, and that the price of energy is going to stay stable and ... you get the idea.)

Wind power in an urban setting comes with its own set of challenges.

A natural lack of regular winds forceful enough to generate meaningful amounts of electricity.

Most "wind farms" are located in areas with high, steady winds and use giant turbines. In fact, the trend has been to build larger windmills capable of generating ever more electricity.

In 2006, Technology Review ran an interesting piece about plans for a new turbine with a rotor with a 140 meter diameter.

Sometimes, however, smaller still is beautiful -- and more appropriate.

So some manufactures, like the Flagstaff, Ariz.-based Skystream, have been building scaled down wind turbines like the ones on top of Twelve|West.

One advantage of the Skystream 3.7 is its lower wind speed requirement. With its 12-foot diameter, the rotor can begin generating electricity with winds blowing at just 8 miles per hour. It reaches peak production (2.4kW) at 29 mph and will continue to operate at winds up to 60 mph. (The Skystream 3.7 is built to withstand gusts of up to 140 mph.)

Wind flow in urban areas is disrupted by other buildings.

Placing the turbines on top of a 23-story building, and then mounting them on 45-foot poles puts the blades at an elevation of 82 meters (270 feet), high enough to escape the distortions of the surrounding built environment.

Still, critics of the project have said that the expense of putting the four turbines into operation outweighs the financial payback delivered in energy savings.

The building's other eco-features include graywater in the toilets -- leading to this helpful warning.But Robert Packard, a managing partner of the architectural firm ZGF, which occupies the lower four floors of Twelve|West and also designed the building, thinks those critics are missing the point. Packard told the Oregonian newspaper, "[We're] trying something new. It's not a gimmick. Not only are we learning, but we can share it with the world, add to the body of knowledge that's out there."

Kind of like when solar photovoltaic panels were just getting popular. Not every idea that worked well in the lab made it in the real (rooftop) world.

I'm hoping the information they get from the four turbines helps the shift from a fossil-fuel to a renewable energy economy. But I have to admit, just the sight of windmills spinning on urban rooftops -- 20 or more stories up -- has an appeal all its own.

Osha Gray Davidson blogs regularly for Grist and edits The Phoenix Sun, where this post first appeared in a different form.

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Seattle is the most sustainable big city in the nation, according to a list compiled by Smarter Cities, an NRDC project that looks at the progress American cities are making toward going green. Not surprisingly, San Francisco and Portland are the runners-up.

Using data from the EPA and the U.S. Census Bureau, as well as some voluntary survey responses from city governments, the project identified the top 15 large, medium, and small cities according to 10 different environmental criteria, from air quality to recycling to transportation.

Here's a look the top 15 large cities (population of 250,000 or more):

It's hard not to be environmentally minded in a city with views like this.Photo: Simonds1. Seattle
The Emerald City gets props for its brand-new light rail system, reliance on hydroelectricity (and the resulting good air quality), Mayor Greg Nickels' U.S. Conference of Mayors Climate Agreement, and two global warming initiatives: Seattle Climate Action Now and Seattle Climate Partnership. Seattleites are described as "highly educated and environmentally minded." Think it's just a coincidence that Grist is headquartered here?

San Francisco is one of the most densely populated cities in the country.Photo: ATIS5472. San Francisco
San Francisco's dense population, walkability, plastic-bag ban, city-created carbon offset fund, solar power program, and booming local food movement propelled it to the No. 2 spot. (Read more about Mayor Gavin Newsom's green efforts.)

Portland has always been a leader in big-city sustainability.Photo: Ben Amstutz3. Portland
Seattle's neighbor to the south got its light rail up and running more than 20 years ago, and the city has always been ahead of the curve on controlling urban sprawl and suppressing greenhouse-gas emissions. Portland's residents also recycle more than half their waste.

Oakland is making a green comeback.Photo: satanslaundromat4. Oakland, Calif.
This once-struggling city has a Green Jobs Corps, a New Urbanist 10K Downtown Housing Initiative, a Zero Waste Plan, and a growing local food movement (as urban farmer Novella Carpenter explains). It also gets 17 percent of its electricity from renewable sources. Sounds like there is a there there.

How green was my Silicon Valley?Photo: the_tahoe_guy5. San Jose, Calif.
Always on the cutting edge of the high-tech world, this capital of Silicon Valley is fast on its way to leading the green-jobs revolution. Its Green Vision includes plans for bringing 25,000 new clean-tech jobs to the area.

Austin's new smart grid will light up the night -- sustainably, of course.Photo: Visualist Images6. Austin, Texas
A liberal outpost in red Texas, this city owns its electric utility (meaning voters elect the utility's board) and plans to adopt a smart grid in the near future.

Sacramento aims to be green while it grows.Photo: kla40677. Sacramento, Calif.
The Golden State's capital, while suffering from the side effects of rapid population growth, has a progressive, publicly owned utility that, in addition to offering a 100 percent renewable power option, provides free trees to residents hoping to cool their homes with natural shade.

Boston stands out among less-green East Coast cities.Photo: werkunz18. Boston, Mass.
Boston's push toward wind and solar energy, its efforts to become more bike-friendly, and its LED traffic lights make it a leader on the environmentally lagging East Coast.

Denver conserves water like nobody's business.Photo: kla40679. Denver, Colo.
The Mile High City is already way ahead of its goals for reducing water consumption. Its new bike-sharing and composting programs and extensive system of city parks also helped it make the top 15.

Chicago's city hall has its own green roof.Photo: Smarter Cities10. Chicago
Always famous for its architecture, today Chicago has more LEED-certified buildings than any other U.S. city and boasts 300 green roofs. (Read more about Mayor Richard Daley's green efforts.)

San Diego is growing smart.Photo: Smarter Cities11. San Diego
Parks and open spaces make up almost a quarter of this city's land area, and its smart growth program has led to impressive developments.

The Big (Green) Apple.Photo: mikeleeorg12. New York City
What it lacks in air quality and renewable energy it makes up for in density, walkability, and Mayor Bloomberg's commitment to reducing the city's carbon footprint. (Read more about Bloomberg's green efforts.)

L.A. works to clear a path through the smog.Photo: Storm Crypt13. Los Angeles
Infamous for its smog and clogged freeways, L.A. is making admirable efforts to switch to renewable energy and conserve its water supply.

Big D: Greener than you'd think.Photo: dherrera_9614. Dallas
Dallas gets 40 percent of its electricity from wind, has seen a huge spike in public transit usage in recent years, and cracks down on lengthy truck idling during the "ozone season" from April to October.

Columbus hopes for an urban resurgence.Photo: jpmueller9915. Columbus, Ohio
A perhaps unexpected entry on the list, flat Columbus lends itself to bike-friendliness. The city has also been working hard to revitalize its downtown core and combat sprawl.

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For the fourth year in a row, Portland, Ore., has been named the most sustainable of the 50 largest U.S. cities. The rankings by green org SustainLane, which take 16 economic and quality-of-life factors into consideration, "reveal which cities are increasingly self-sufficient, prepared for the unexpected, and taking steps toward preserving and enhancing their quality of life," says the group. After Portland, this year's top 10 include San Francisco, Seattle, Chicago, New York, Boston, Minneapolis, Philadelphia, Oakland, and Baltimore. The bottom 10: Nashville, Arlington (Tex.), Long Beach, Colorado Springs, Indianapolis, Virginia Beach, Memphis, Las Vegas, Tulsa, Oklahoma City, and Mesa. Columbus made the biggest improvement over SustainLane's last list, jumping from No. 50 to No. 30; Las Vegas saw the biggest freefall, from No. 27 to No. 47. Unsurprisingly -- but still unfortunately -- the most affordable cities tended to score the worst on public transit, bike-friendliness, and walkability.

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Portland, Ore., proposed an ambitious green-building plan last month that was to go before voters in January. But the building and real-estate industries were taken aback by the announcement and have expressed concerns; City Commissioner Dan Saltzman now hopes to have a draft before the city council in three to six months.

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Portland, Ore., has unveiled an innovative plan to slash greenhouse-gas emissions. The city will require an energy-efficiency inspection of new homes, then levy a tax on builders who have merely complied with Oregon's efficiency requirements. Builders who construct homes 30 percent more efficient than the state building code requires will escape the fee; those who go above and beyond, with construction that saves at least 45 percent more energy, will be paid cash rewards. Portlanders will vote on the plan in January. Hint: vote yes!

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A Think Outside the Bottle campaign kicked off today, urging municipal governments to cut off bottled-water contracts and to press for greater disclosure of the source of bottled H2O. The campaign is spearheaded by Corporate Accountability International and joined by cities including Boston, Minneapolis, Sacramento, and Portland, Ore., many of which held taste tests today to see if consumers can tell the difference between bottled and tap water. Chicago's mayor urged a 10-cent tax on bottled water, while Salt Lake City Mayor (and official Grist crush) Rocky Anderson told it like it is: "When I see people ... waste their money buying bottled water at the vending [machine] when it's standing right next to a water faucet, you really have to wonder at the utter stupidity and the responsibility sometimes of American consumers." Not to be outdone, the International Bottled Water Association issued a press release stating that the campaign is "based on factual errors and subjective viewpoints."

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These metropolises aren't literally the greenest places on earth -- they're not necessarily dense with foliage, for one, and some still have a long way to go down the path to sustainability. But all of the cities on this list deserve recognition for making impressive strides toward eco-friendliness, helping their many millions of residents live better, greener lives. If your favorite green city didn't make the list, tell us why it deserves recognition in the comments section at the bottom of the page.

Reykjavik, Iceland
Remember the grade-school memory device "Greenland is icy and Iceland is green"? It's truer than ever thanks to progress made by Iceland and its capital city in recent years. Reykjavik has been putting hydrogen buses on its streets, and, like the rest of the country, its heat and electricity come entirely from renewable geothermal and hydropower sources and it's determined to become fossil-fuel-free by 2050. The mayor has pledged to make Reykjavik the cleanest city in Europe. Take that, Greenland.

Portland, Oregon, U.S.
The City of Roses' approach to urban planning and outdoor spaces has often earned it a spot on lists of the greenest places to live. Portland is the first U.S. city to enact a comprehensive plan to reduce CO2 emissions and has aggressively pushed green building initiatives. It also runs a comprehensive system of light rail, buses, and bike lanes to help keep cars off the roads, and it boasts 92,000 acres of green space and more than 74 miles of hiking, running, and biking trails.

Curitiba, Brazil
With citizens riding a bus system hailed as one of the world's best and with municipal parks benefiting from the work of a flock of 30 lawn-trimming sheep, this midsized Brazilian city has become a model for other metropolises. About three-quarters of its residents rely on public transport, and the city boasts over 580 square feet of green space per inhabitant. As a result, according to one survey, 99 percent of Curitibans are happy with their hometown.

Malmö, Sweden
Known for its extensive parks and green space, Sweden's third-largest city is a model of sustainable urban development. With the goal of making Malmö an "ekostaden" (eco-city), several neighborhoods have already been transformed using innovative design and are planning to become more socially, environmentally, and economically responsive. Two words, Malmö: organic meatballs.

Vancouver, Canada
Its dramatic perch between mountains and sea makes Vancouver a natural draw for nature lovers, and its green accomplishments are nothing to scoff at either. Drawing 90 percent of its power from renewable sources, British Columbia's biggest city has been a leader in hydroelectric power and is now charting a course to use wind, solar, wave, and tidal energy to significantly reduce fossil-fuel use. The metro area boasts 200 parks and over 18 miles of waterfront, and has developed a way-forward-thinking 100-year plan for sustainability. Assuming civilization will last another 100 years? Priceless.

Copenhagen, Denmark
With a big offshore wind farm just beyond its coastline and more people on bikes than you can shake a stick at, Copenhagen is a green dream. The city christened a new metro system in 2000 to make public transit more efficient. And it recently won the European Environmental Management Award for cleaning up public waterways and implementing holistic long-term environmental planning. Plus, the pastries? Divine.

London, England
When Mayor Ken Livingstone unveiled London's Climate Change Action Plan in February, it was just the latest step in his mission to make his city the world's greenest. Under the plan, London will switch 25 percent of its power to locally generated, more-efficient sources, cut CO2 emissions by 60 percent within the next 20 years, and offer incentives to residents who improve the energy efficiency of their homes. The city has also set stiff taxes on personal transportation to limit congestion in the central city, hitting SUVs heavily and letting electric vehicles and hybrids off scot-free.

San Francisco, California, U.S.
Nearly half of all 'Friscans take public transit, walk, or bike each day, and over 17 percent of the city is devoted to parks and green space. San Francisco has also been a leader in green building, with more than 70 projects registered under the U.S. Green Building Council's LEED certification system. In 2001, San Francisco voters approved a $100 million bond initiative to finance solar panels, energy efficiency, and wind turbines for public facilities. The city has also banned non-recyclable plastic bags and plastic kids' toys laced with questionable chemicals. Next thing you know, they'll all be wearing flowers in their hair.

Bahía de Caráquez, Ecuador
After it suffered severe damage from natural disasters in the late 1990s, the Bahía de Caráquez government and nongovernmental organizations working in the area forged a plan to rebuild the city to be more sustainable. Declared an "Ecological City" in 1999, it has since developed programs to protect biodiversity, revegetate denuded areas, and control erosion. The city, which is marketing itself as a destination for eco-tourists, has also begun composting organic waste from public markets and households and supporting organic agriculture and aquaculture.

Sydney, Australia
The Land Down Under was the first country to put the squeeze on inefficient, old-school light bulbs, but Sydney-dwellers took things a step further in March, hosting a city-wide one-hour blackout to raise awareness about global warming. Add to that their quest for carbon neutrality, innovative food-waste disposal program, and new Green Square, and you've got a metropolis well on its way to becoming the Emerald City of the Southern Hemisphere.

Barcelona, Spain
Hailed for its pedestrian-friendliness (37 percent of all trips are taken on foot!), promotion of solar energy, and innovative parking strategies, Barcelona is creating a new vision for the future in Europe. City leaders' urban-regeneration plan also includes poverty reduction and investment in neglected areas, demonstrating a holistic view of sustainability.

Bogotá, Colombia
In a city known for crime and slums, one mayor led a crusade against cars that has helped to make Bogotá one of the most accessible and sustainable cities in the Western Hemisphere. Enrique Peñalosa, mayor from 1998 to 2001, used his time in office to create a highly efficient bus transit system, reconstruct sidewalks so pedestrians could get around safely, build more than 180 miles of bike trails, and revitalize 1,200 city green spaces. He restricted car use on city streets during rush hour, cutting peak-hour traffic 40 percent, and raised the gas tax. The city also started an annual "car-free day," and aims to eliminate personal car use during rush hour completely by 2015. Unthinkable!

Bangkok, Thailand
Once known for smokestacks, smog, and that unshakeable '80s song, Bangkok has big plans for a brighter future. City Governor Apirak Kosayodhin recently announced a five-year green strategy, which includes efforts to recycle citizens' used cooking oil to make biodiesel, reduce global-warming emissions from vehicles, and make city buildings more efficient. Bangkok has also made notable progress in tackling air pollution over the past decade. Though the city's pollution levels are still higher than some of its big-city Asian counterparts, its progress thus far is impressive.

Kampala, Uganda
This capital city is overcoming the challenges faced by many urban areas in developing countries. Originally built on seven hills, Kampala takes pride in its lush surroundings, but it is also plagued by big-city ills of poverty and pollution. Faced with the "problem" of residents farming within city limits, the city passed a set of bylaws supporting urban agriculture that revolutionized not only the local food system, but also the national one, inspiring the Ugandan government to adopt an urban-ag policy of its own. With plans to remove commuter taxis from the streets, establish a traffic-congestion fee, and introduce a comprehensive bus service, Kampala is on its way to becoming a cleaner, safer, more sustainable place to live.

Austin, Texas, U.S.
Austin is poised to become the No. 1 solar manufacturing center in the U.S., and its hometown utility, Austin Energy, has given the notion of pulling power from the sun a Texas-sized embrace. The city is on its way to meeting 20 percent of its electricity needs through the use of renewables and efficiency by 2020. Austin also devotes 15 percent of its land to parks and other open spaces, boasts 32 miles of bike trails, and has an ambitious smart-growth initiative, making it a happy green nook in what's widely perceived as a not-so-green state. To put it mildly.

Chicago, Illinois, U.S.
Mayor Richard M. Daley (D) is striving to make his hometown "the greenest city in America." There's lots of literal greenery: under his leadership, Chicago has planted 500,000 new trees, invested hundreds of millions of dollars in the revitalization of parks and neighborhoods, and added more than 2 million square feet of rooftop gardens, more than all other U.S. cities combined. And there's plenty of metaphorical greening too: the Windy City has built some of the most eco-friendly municipal buildings in the country, been a pioneer in municipal renewable-energy standards, provided incentives for homeowners to be more energy efficient, and helped low-income families get solar power.

Freiburg, Germany
Home to the famously car-free Vauban neighborhood and a number of eco-transit innovations, Freiburg is a tourist destination with a green soul. The city has also long embraced solar power.

Seattle, Washington, U.S.
Mayor Greg Nickels (D) has committed his city to meeting the emission-reduction goals of the Kyoto climate treaty, and inspired more than 590 other U.S. mayors to do the same. True to its name, the Emerald City is also planting trees, building green, and benefiting from biodiesel and hybrid buses.

Quebec City, Canada
Dubbed the most sustainable city in Canada by the Corporate Knights Forum, Quebec wins big points for clean water, good waste management, and bike paths aplenty. C'est magnifique!

Kate Sheppard contributed to this list.

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