Reuters: In the first legal test of the Obama administration's plan to limit greenhouse gas emissions from power plants, two of three federal judges hearing a challenge to the regulations on Thursday expressed skepticism about weighing in before they are formally adopted. More than a dozen states and Murray Energy Corp [MUYEY.UL] have filed lawsuits challenging the administration's proposal, which would require the U.S. power sector to slash carbon dioxide emissions by 30 percent from 2005 levels. Judges...