The latest round of UN climate change talks kicked off in Bonn, Germany today, as UN officials voiced growing pessimism that the negotiations to agree a meaningful successor to the Kyoto Treaty at a meeting in Copenhagen later this year are falling dangerously behind schedule. Speaking at the opening of the five days of informal talks, the UN’s top climate official Yvo de Boer told BBC News he was increasingly worried that with many of the major emitters remaining at loggerheads. There are now 117 days until the start of the Copenhagen conference in December where a successor to Kyoto is expected to be agreed. But de Boer warned that talks surrounding many of the key issues such as emissions targets and financing for clean technologies in the developing world remain deadlocked.