Agence France-Presse: US President Barack Obama on Wednesday unveiled a new strategy to reinvigorate US production of biofuels, vowing he would not let nations like China race ahead in building new energy economies. Obama is embracing a host of traditional sources of power, including coal and nuclear and new energy sources, like wind power, as he attempts to improve dim prospects for cap-and-trade climate legislation in Congress. He said his government’s Environmental Protection Agency had mandated …