Associated Press: Michigan’s senators reached an agreement with lawmakers pushing tougher fuel efficiency standards Thursday that environmentalists fear could hinder the Environmental Protection Agency from regulating greenhouse gas emissions in the future. Sens. Carl Levin and Debbie Stabenow, D-Mich., refused to vote for an energy bill to move forward unless Sen. Dianne Feinstein, D-Calif., agreed that the tough new fuel efficiency standards in the bill would not be undercut in the future by EPA …