Petroleum is Most Green?
Biofuels are often looked at as a possible significant solution to global warming; however, some studies have indicated the biofuels may actually be less green that good, old fashioned petroleum. An article in the environment section of Popular Science (Popsci.com) says just that (Is Petroleum the Greenest Fuel We Have?).
The article talks about a number of ways in which biofuels can contribute to global warming, including clearing land for the crops needed for biofuels, much of the which has resulted in deforestation of rain forests. It's also believed that scrub is more effective at absorbing CO2 than crops.
There may be a way around some of these problems, though. While corn has often been criticized as being a poor source of ethanol (including because of the resulting increase in many food prices), something called switchgrass, which is a native prarie plant, solves some of those problems.
