although the british government has won assurances from the industriazed nations that it will be on the table next year. so plenty of bumps in the road, and the british prime minister was sounding a little downbeat today, when asked about the prospects for success at this summit. is going to be very, very tough for this summit. and i m very worried because it might go wrong. and we might not get the agreements that we need, and it s touch and go. with me is our science editor david shukman. the bottom line here is that a key pledge that was made by the developed countries, what, in 2009? still has not materialised. this developed countries, what, in 2009? still has not materialised. still has not materialised. this is fundamental still has not materialised. this is fundamental stuff. still has not materialised. this is fundamental stuff. i still has not materialised. this is fundamental stuff. i was - still has not materialised. this is fundamental stuff. i was there i still has