"Keeping the show on the road" may be all governments can hope for at next week's UN climate talks, the UK admits.Energy and Climate Secretary Chris Huhne said there was no chance of getting a legally binding deal at the summit in Cancun, Mexico.The aim, he said, should be to get "within shouting distance". Meanwhile, the World Meteorological Organization (WMO) released data showing that greenhouse gas levels continued their rise through 2009.It follows publication of a scientific paper at the weekend suggesting that without new constraints, global carbon emissions will re-commence rising at 2-3% per year, following a brief lull...