McClatchy Newspapers: How much will it cost the average American household to reduce the U.S. share of global warming pollution and shift to cleaner sources of energy produced at home? If Congress passes a law that puts the country on a path to that outcome, the answer on costs will depend on what kind of consumer protections are part of the new policy. The House of Representatives could vote on a bill produced by Reps. Henry Waxman , D- Calif. , and Ed Markey , D- Mass. , this week or after lawmakers …