Agence France-Presse: US President Barack Obama on Friday announced a climate deal with other major world leaders calling it "unprecedented" but still not enough to beat global warming. More than four hours after the scheduled close of the summit and an exhaustive round of diplomacy between the world’s most powerful leaders, Obama said an agreement had been reached but acknowledged it was limited and would not be legally binding. The pact includes an agreement to put off until next month a decision …