Will biofuel leave the poor hungry?

"If you start to fuel cars with crops," says Ed Matthew, "you are instantly putting the world's one billion starving people in competition with the world's one billion motorists. It's as simple as that."

Green groups and aid agencies cite biofuels as forming part of the "perfect storm" of poor harvests, rising oil prices and a surge in demand for food from China and India that are all pushing up the price of everything from pasta to a loaf of bread.

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