Even with oil prices soaring, by some estimates, they're still short of historic highs.
Sometimes carbon credits fund clean industries that would prosper anyway.
Creating and ordering my greeting cards online was easy, but the layers of packaging make me wonder if I've damaged the earth in the process.
There's nothing simpler than avoiding having to wash dishes by just throwing them away. Sometimes it's best to adopt the more complex route for the sake of being green.
The projection that U.S. farmers will grow less corn this year is bad news for ethanol producers.
GM and Toyota leaders admit that hydrogen fuel cells have serious problems.
At the Geneva Motor Show, GM unveils a new system for improving fuel economy.
Producing ethanol might increase greenhouse emissions, but the funding to find out is being cut.
New studies show that it takes less energy to grow cellulosic crops.
A plan to build the largest wind farm in New England has received final approval.