Washington Post: A bill to cap U.S. greenhouse-gas emissions, hailed on Capitol Hill as a historic breakthrough, went over with a soft thud this week during international negotiations, criticized as inadequate for the climate and unfair to poor countries. The bill passed a House of Representatives committee last month and is regarded as the most serious effort yet to reduce U.S. contributions to climate change. But at a United Nations-led conference in Bonn, Germany, and at a summit of mega-emitters …