Washington Post: The House yesterday passed a massive bill designed to cap U.S. greenhouse gas emissions. Among its provisions: — Emissions from a large sector of the U.S. economy, including power plants, factories and auto tailpipes, would be required to be cut 17 percent below their 2005 levels by 2020, and 83 percent below those levels by 2050. — These reductions would be managed by requiring emitters to amass buyable, sellable “credits” equal to their pollution. — About 85 percent …