Bloomberg: Former U.S. Vice President Al Gore said he can do more to fight global warming as a private citizen than he could working as a government official even if Barack Obama wins the presidency. “My own best role is to try to bring about a sea change in public opinion,” Gore said today on NBC’s “Meet the Press.” “Policy makers who know the right thing to do run up against a wall set up all around them by the lobbyists and the special interests,” he said. James Carville, a …