New York Times: In a tumultuous final session at international climate talks in which the US delegates were booed and hissed at, the world’s nations committed yesterday to negotiating a new accord by 2009 that, in theory, would set the world on a course toward halving emissions of heat-trapping gases by 2050. The finish to the negotiations came after a last-minute standoff during a day of high emotions, with the co-organizer of the conference, Yvo de Boer, fleeing the podium at one point as he held …