CHICAGO - Sen. Barack Obama accused the Bush administration Monday of a "stubborn refusal" to attack the causes of climate change, and said tougher fuel standards, stricter curbs on oil imports and more investment in cleaner energy are essential to avert global catastrophe. "Saying that America is addicted to oil without following a real plan for energy independence is like admitting alcoholism and then skipping out on the 12-step program," the Illinois Democrat said. He referred to one of the principal themes of President Bush's State of the Union address Jan. 31. "It's not enough to identify the challenge. We...