If you're a climate activist—or you just care about clean air and water—today was a pretty darn good day. It wasn't the first day that President Obama took strong climate action, but it was perhaps the most significant. Over his first four years, Obama raised fuel efficiency standards to historic levels and made the single largest investment in clean energy ever, the Stimulus Plan, which contains over $90 billion for green projects. But Obama hadn't gone after the single largest source of carbon pollution, coal, which accounts for about 40 percent of U.S. emissions.

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