Bloomberg: U.K. fuels for cars and trucks must contain biofuels starting today, a move that may do more harm than good to the environment and drive food prices higher, charities including Oxfam and Greenpeace said. Under the Renewable Transport Fuel Obligation, suppliers must ensure that 2.5 percent of fuel sold at U.K. pumps consists of biofuels, which are made from crops and grasses. The requirement will rise to 5 percent by 2010. The Department for Transport says the plan will cut …