Biofuels are not the answer - less use of energy is the first port of call.
National Express buses have just pulled out of using biofuels because of the controversy that is beginning to wage round them.. More land used for biofuel means less land for wheat and maize grown in America, ask the poor countries of the world what they want, Mexico is already experiencing difficulties with the high price of maize (for tortillas I presume). The link below is probably one of hundreds pointing out the high cost of biofuel not only on the eco system of this world but also to those that can't afford the price of basic food.....
http://www.alternet.org/environment/54218/
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