PolitiFact: President Barack Obamas second-term promise to tackle climate change has clashed with election-year politics. Much of the political debate has focused on the Environmental Protection Agencys newly proposed regulations on existing power plants. If enacted, the rules would curb carbon emissions that scientists say cause global warming. Misinformation about these new regulations started even before the EPA released them. In the days leading up to the EPAs June 2 announcement, the U.S. Chamber...