Yale Environment 360: The Obama Administrations recent announcement that it plans to regulate greenhouse gas emissions from existing coal-fired power plants evoked cries of protest and warnings of economic doom from the political right, and praise from the center and the left. As the controversy over the proposed rules continues to unfold, two important questions loom: What is the likelihood that these new regulations will actually be put into effect, Jeff Swensen/Getty Images The new EPA rules aim for a 30 percent reduction...