Reuters: The U.S. Environmental Protection Agency's plan to focus on cracking down on just the largest polluters will deliver "lasting returns" to the American public, its top enforcement official said on Thursday. Cynthia Giles, assistant administrator for the EPA's office of enforcement, wrote in a blog post that the agency remained committed to punishing polluters that violate U.S. rules but needed to prioritize because of budgetary and staffing constraints. "Focusing on large, high impact cases requires...