Environmentalists, utilities, and green businesses are turning to behavioral economics to find innovative ways of influencing people to do the right thing when it comes to the environment. Is this approach really good for the planet or just a fad?

Mostly conceived by international architects, China’s eco-cities were intended to be models of green urban design. But the planning was done with little awareness of how local people lived, and the much-touted projects have largely been scrapped.

The economic downturn need not halt the development of green energy. In fact, with renewable technologies improving dramatically and new U.S. policies emerging, continued progress toward an energy revolution is inevitable.

The number of vehicles worldwide is expected to reach two billion in the next two decades. Surprisingly, China where the demand for cars has been skyrocketing just may offer the best hope of creating a new, greener transportation model.

Yale University’s recently opened Kroon Hall is a state-of-the-art model of where the green building movement is headed. Yet even this showcase for renewable energy highlights the difficulties of creating a building that is 100 percent carbon neutral.

In the last few decades, urban sprawl, once regarded as largely a U.S. phenomenon, has spread across Europe. Now an emerging group of planners is promoting a new kind of development — mixed-use, low-carbon communities that are pedestrian-friendly and mass-transit-oriented.

Many environmentalists assume that putting a price on carbon and creating a renewable energy economy will require major public sacrifice. But the Sierra Club’s Carl Pope argues that a well-designed package of market reforms — not austerity — will lead to a prosperous, low-carbon future.

In a bold departure from past U.S. policies, President Barack Obama sees clean energy and “green jobs” as critical components of an economic stimulus strategy.

The potential for electric vehicles has been talked about for decades. But a former Israeli software entrepreneur is developing a game-changing infrastructure that could finally make them feasible — a standardized network of charging stations where drivers can plug right in.

You’ve heard the environmental horror stories: rivers running black, air unfit to breathe, two new coal-fired power plants a week. But thanks to a surging entrepreneurial spirit and new policies, China is fast becoming a leader in green innovation, from recycling to developing electric cars to harnessing the wind.

U.S. cities have been using green planning to spark economic development, helping create a real urban renaissance in America. With a new administration soon to arrive in Washington, these same approaches may finally start being used on a national scale.

After years of false starts and failures, the electric car may finally be poised to go big-time. With automakers from GM to Chrysler to Nissan preparing to roll out new plug-in hybrids or all-electric models, it looks like the transition from gasoline to electricity is now irreversible.

After years of optimistic predictions and false starts, it looks like solar's moment is here at last. Analysts say a pattern of rapid growth, technological breakthroughs, and falling production costs has put solar power on the brink of becoming the world's dominant electricity source.

The coal industry, political leaders, and some environmentalists have high hopes for the concept of carbon sequestration, which takes carbon dioxide emissions from coal plants and buries them underground. But so far, this new technology does not live up to the hype.