Agence France-Presse: Top climate scientists said Saturday that the eleventh-hour political deal hammered out at UN talks in Copenhagen falls perilously short of what is needed to stave off catastrophic global warming. What many had hoped would be a planet-saving treaty locking major economies into strong commitments to shrink their carbon footprints came out as a three-page political accord with key numbers yet to be filled in. "The easiest yardstick to evaluate is the two degree target," said …