Politico: The Environmental Protection Agency Thursday rejected an effort to keep it from regulating greenhouse gas emissions, saying that e-mails released in last fall’s “Climategate’ scandal gave it no reason to reconsider the science of global warming. In a sternly written opinion, EPA Administrator Lisa Jackson said she didn’t agree with requests from the GOP attorneys general from Texas and Virginia, the U.S. Chamber of Commerce and other conservative groups that questioned the underlying …