The next generation of semi-synthetic fuels derived from non-food biomass, coal and natural gas could remove America's reliance on dwindling oil reserves as well as allowing the nation to lower its overall carbon emissions. Princeton University's Christodoulos Floudas and his team have evaluated various scenarios involving removing oil from the US energy equation. The goal is to produce sufficient fuel and also to cut carbon dioxide emissions, or the equivalent, by 50%, he explains. The question was not only can it be done, but also can it be done in an economically attractive way. The answer is affirmative in both cases.