ThinkProgress: The Obama Administration took the most serious step toward limiting carbon pollution of any in history. And besides its proposed rules for power plant carbon pollution, the White House has already helped bring about an explosion in solar and wind power, along with very strong fuel economy rules negotiated with the major automakers. But the grade the President merits for his climate policies to date is still an I for Incomplete until he takes two more major steps: regulate methane leaks from the...