Agence France-Presse: Top Senate Democrats on Thursday said they would introduce major global warming legislation early next year, saying Barack Obama’s election meant a “sea change” in the battle against climate change. Skip related content The announcement came just two days after president-elect Obama, in one of his first major policy pronouncements since his historic victory two weeks ago, warned that denial of global warming would no longer be US policy. “The time to start is now,” said …