United Nations climate chief says Danish presidency's backing for US also derailed Copenhagen negotiations
Costa Rican diplomat appointed as executive secretary of the United Nations Climate Change Secretariat
Report claims Ban Ki-moon could confirm surprise appointment this week
Report urges UN to adopt energy efficiency target requiring 2.5 per cent cut in global economy's energy intensity each year
Major new study warns environmental pressures mean China has no choice but to accelerate low-carbon development plan
Weekend talks expected to focus on procedural issues, but subject will inevitably turn to post-Copenhagen fall out and race to replace Yvo de Boer
All major greenhouse gas emitters bar Russia have now formally endorsed Copenhagen deal
As India formally backs Copenhagen Accord, Merkel and Hedegaard express scepticism that a binding international emissions deal can be reached this year
Tourism minister Marthinus van Schalkwyk front-runner to take over from outgoing Yvo de Boer