Natural-gas vehicles offer a clean and economical ride. Filling up will run you about $1.20/gallon. Get the details on Clark's new ride. ... More >

Some European cities have had great success reducing air pollution and traffic with bike-sharing programs. Now several U.S. cities want a piece of the action. ... More >

Thinking about buying a non-polluting natural gas vehicle? You'll need to install a "Phill" home refueling stations to make it a reality. ... More >

There's a push in four states to reward power companies when they get their customers to conserve energy. Clark looks at the new trend. ... More >

A wind turbine at home ensures that you'd never have to worry about power in the event of a blackout. ... More >

Clark is known to be cheap, but not as cheap as those in the "freegan" movement. Find out what he thinks about this dumpster-diving trend. ... More >

If your commute is less than 10 miles, find out about some great ways to save money and protect the environment. ... More >

Clark has another idea to encourage people to choose paper over plastic bags at the grocery ... and it may be even more controversial than the ban. ... More >