more than two hours ago, but last minute haggling could see negotiations go on well into the night. the president of the summit, alok sharma, says delegates have come a long way in the last two weeks, and he now hopes there ll be a final injection of what he calls a can do spirit . greenpeace is urging delegates to agree something historic, but can there be a deal that satisfies everyone. well the aim of the summit was to try to reach agreement, among more than 190 countries, to limit global warming to 1.5 degrees celcius. but the sticking points that remain include finding tougher language, to secure commitments, to phase out coal and other fossil fuels. and finding more money, to help developing nations fight climate change, and make the switch to greener technology. with the very latest from the summit, here s our science editor, david shukman. siren wails. a warning from outside the conference about the state of progress inside. world leaders are singled out for failing