Article Photos: Mark Tapscott: Why his Cap and Trade threat to Congress is Obama's - and America's - Rubicon



President Obama threatened Congress in his State of the Union address, telling them to act on carbon emissions, or else he would do so unilaterally. (Photo: J. Scott Applewhite/AP file)

President Obama threatened Congress in his State of the Union address, telling them to act on carbon emissions, or else he would do so unilaterally. (Photo: J. Scott Applewhite/AP file)