Biofuels in the aviation industry

I read an article about how the aviation industry is trying to switch to biofuels in an effort to cut gas prices and greenhouse gas emissions. However, researches found large variability in the greenhouse gas emissions of the different biofuels they tested. The article cited MIT, who thought they should not make the switch, at least not as quickly as the aviation industry plans to. They found that when the origins of the biofuel is taken into consideration, what might seem like a promising source of renewable energy might actually be worse for the environment than fossil fuels. Although the article seemed schizophrenic at times, the general feel I got was that the author thought more care needed to be taken when choosing renewable sources of energy, and that industries needed to be thorough and studious, and do the research so they know how green the fuels are before they start to use them.

http://www.sciencedaily.com/releases/2011/05/110511134335.htm