The biggest, most totemic, issue remains the IPCC's adoption of the "hockey stick" narrative, which holds that 20th-century warming is unique over the past millennium. Most in Lisbon saw this as a scandalous example of IPCC editors taking sides in an unresolved debate, and of how "scientific findings were judged according to their political utility".

Third, most agreed that there was no scientific basis for the world adopting a target to prevent global warming going above 2 °C. It was "arbitrary", they said, and cooked up by climate scientists with a political agenda.

2 quotes and plenty more cynicism of the IPCC.
 http://www.newscientist.com/blogs/shortsharpscience/2011/02/climate-sceptics-scientists-at.html

It will be good if they can finally agree that the sun is at the centre of our Solar System, then we can all move on and address the serious issues like deforestation and the production of ozone destroying chemicals and the poisoning of the seas.

If we are not careful we will be left with a nuclear legacy and the consequences left for our grandchildren.