Associated Press: The president-elect won’t be there, but an Obama buzz will crackle through the conference hall when negotiators gather Monday for a final push toward a sweeping new global warming treaty. “America is back,” says Sen. John Kerry, underscoring that Barack Obama’s election signals a U.S. intent to regain a leadership role on climate change. “After eight years of obstruction and delay and denial, the United States is going to rejoin the world community in tackling this global …