Can biofuels become the next petroleum?

Reuters: From Rio de Janeiro to Amsterdam, biofuels are all the rage but can "green fuel" take on oil to become a long-term viable alternative to fossil fuels? Analysts say production of biofuels -- made from sugars, cereals and vegetable oils -- cannot be scaled up substantially to reduce global dependence on oil because of limited raw materials, high cost, lack of a global market and uncertainty over government policies. A second generation of biofuels, based on non-food ...Link