At the opening ceremony of Climate Week New York last month, Tony Blair drew a laugh from the crowd when he quipped: "It's a relief after the weeks I've spent deep in the entrails of the Middle East peace process to talk about something that's relatively easy to solve."
In some respects he's right. The solutions to climate change are relatively straightforward (phasing out fossil fuels for one), if somewhat challenging to implement. But the negotiations? The politics driving them are as difficult as they come, with the future of the Kyoto protocol at the centre of the conflict.