In this video segment adapted from ZOOM, visit a class as they design a city of the future that will use solar, wind, and water power to fuel its economy. [2:12]

Maxwell von Stein, a 22-year-old graduate of The Cooper Union, built bicycle that uses a flywheel to store energy. Instead of braking, Max can transfer energy from the wheel to the flywheel, which spins between the crossbars. The...

This week, Secretary of the Interior Ken Salazar approved the long-embattled Cape Wind offshore wind power project. We'll talk about the decision, and what it means for other renewable power projects in the country.

Carmakers are working to retool for greener cars -- but many of those vehicles won't be ready to hit the road for years. We'll ask some innovators about outside-the-box efficiency ideas that could be undertaken today.

A wind farm off the coast of Cape Cod has won construction approval from the federal government.