Reuters: The United States will fall well short of biofuels mandates on the uncertain development of next-generation fuels made from grasses and wood chips, the government’s top energy forecasting agency said on Wednesday. “The key risk factor is rate of development of cellulosic biofuels technology,” Howard Gruenspecht, the Energy Information Administration’s acting head, said at press conference in Washington introducing the agency’s annual energy forecast. “Near term growth of cellulosic …