This energy auditor helps homeowners lower their utility bills. See the different kinds of rewards that come from energy efficiency.
The Tea Party and the Koch brothers are trying to end Texas's wind energy boom. They didn't reckon with Greg Wortham.
Hybrid, plug-in hybrid, or battery electric: Here's what's good, better, and best for the environment when it comes to cars.
The future may be coming to your garage soon. Batteries that deliver 150 or 200 miles of range are poised to make electric cars ubiquitous.
Inside a wind turbine factory with one of the workers who make them.
Fearing lost profits, the nation's investor-owned utilities are moving to blot out the solar revolution.
Solar engineers are scrambling to make their products smaller and more efficient.