A U.N. concession to delegates at this week's climate talks in Bonn to take off jackets and ties due to recent high temperatures may be going to some participants' heads.

Breaking the back of negotiations for a new climate pact after the Kyoto Protocol expires in 2012 is proving hard work even though the talks' chair hopes to have a new negotiating text on the table by the end of the week.

Developing nations are still blaming the rich for global warming and the issue of who will contribute most to climate financing is still a matter for debate.

A year-end meeting in Cancun looms closer and the pressure is on to get the job done.
Yet, the acronyms being bandied around -- LULUCF, CDM, AAU, AWG-KP, AWG-LCA, REDD, to name a few -- are enough to make your head swim.

Even a Chinese negotiator on Tuesday admitted he did not understand a complicated forestry and land use presentation the previous day by the European Union.