Obama moves toward regulating greenhouse gases

The AP reports:

For a decade, environmentalists and states have urged the federal government to limit greenhouse gases from automobile tailpipes. On Monday, President Barack Obama took a step toward making it happen. He ordered the Environmental Protection Agency to reconsider allowing California, 16 states and the District of Columbia to control the amount of greenhouse gases — mainly carbon dioxide — in truck and car exhaust. It was the clearest signal yet the Obama administration plans to regulate the emissions blamed for global warming.