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Daily Sprout

Renewable Energy Standards Hullabaloo: For all the excitement over a national clean energy mandates, actually putting one in place won’t much change the future energy mix—or the cost of electricity, according to a new analysis from the Energy Information Administration. — WSJ’s Environmental Capital

Musk on Letterman, Letterman on EVs: David Letterman took Tesla CEO Elon Musk’s appearance on his show as an opportunity to rant/joke about Detroit’s electric vehicle efforts. The Chevy Volt’s 40-mile electric range? “Crap.” — CNET’s Green Tech

Efficiency Pays (More) in North Carolina: The North Carolina Utilities Commission has just given the green light for utility Progress Energy to pay customers hundreds of dollars apiece to make their homes more energy efficient. — Triangle Business Journal

Electric Citroen Unveiled: The Citroen C1 ev’ie, an electric sedan for the UK market from a joint venture by Toyota, Citroen and Peugeot, was unveiled today. — BBC News

Yikes, Halfway There: A new study suggests we’ve injected about half as much carbon into the atmosphere as it can take before triggering dangerous temperature changes. How might we avoid the worst-case scenario? Craft a cumulative carbon budget, say scientists. — Wired