It took $3-a-gallon gasoline, the promise of record home heating bills this winter and the White House rolling out a conservation campaign featuring a cartoon pig to give environmentalists something they've been craving for years: A chance to start a national conversation about America's energy problems. The problem for the green movement is that signs of public willingness to listen to environmentalists' message haven't translated into political changes in Washington, D.C. "There is no doubt this is a moment," said David Willet, national spokesman for the Sierra Club. "This is definitely a time when we'd like to push some of...