The new Obama administration generated great expectations, not least among those seeking to craft a successor treaty to the 1997 Kyoto Protocol on “global warming.” Yet early signals that an Obama administration had no plans to join Europe in agreeing to a successor pact next December, as expected, indicated that this issue would instead prove a stunning disappointment to its champions. Now, however, it appears that Kyoto will be the subject of a controversial effort to sharply revise U.S. environmental treaty practice....