Global Warming, the EPA and Republicans in Congress

Whatever the President says tonight about global warming, the Environmental Protection Agency is the next House-Republican target after healthcare reform. The GOP is determined to stop, or delay for years, new regulations of greenhouse emissions being promulgated by the EPA. Last year was the warmest on Earth since 1850, but Congress wasn't alarmed enough to take action, so the EPA began regulating greenhouse emissions. The US Supreme Court said the EPA had no choice if public health was at risk. Republicans say the regulations are job killers that aren't worth the cost. Are they a long-term requirement for coping with global warming or "an unconstitutional power grab" based on scientific uncertainties?