LA Times: President Bush on Wednesday signed an energy bill designed to cut U.S. dependence on overseas oil by imposing the biggest increase in fuel-efficiency standards in 32 years and mandating a fivefold increase in the use of home-grown biofuels. "Today we make a major step toward reducing our dependence on oil, confronting global climate change, expanding the production of renewable fuels and giving future generations of our country a nation that is stronger, cleaner and more …