This handout photo made available by the German Press office shows world leaders including (From L) European Commission President Barroso, German Chancellor Angela Merkel, Swedish Prime Minister Fredrik Reinfeldt, French President Nicolas Sarkozy, US President Barack Obama and Britain’s Prime Minister Gorden Brown hold a meeting at the Bella Centre in Copenhagen on December 18, 2009 on the final day of the COP15 UN Climate Change Conference.World leaders have reached a «meaningful» climate accord but it is not sufficient to combat the threat of global warming, a senior US official said on Friday. AFP PHOTO / HANDOUT / BUNDESREGIERUNG / STEFFEN KUGLER