By Nichola Groom and Valerie Volcovici LOS ANGELES/WASHINGTON(Reuters) - The 27 states challenging Obama’s Clean Power Plan in court say the lower emissions levels it would impose are an undue burden. Already, Arkansas, North Carolina, Oklahoma and South Dakota appear to be meeting the CPP's early targets. “We are seeing reductions earlier than we ever expected,” U.S. Environmental Protection Agency Administrator Gina McCarthy said in an interview.
