DAVOS, Switzerland (AFP) - Celebrity sightings may have been scarce, but the annual gathering of the world's most powerful people in Davos still managed to wrap its air of serious debate in a sheen of glamour. For all the grave talk about the dangers of climate change at the four-day meeting of corporate and political leaders, petrol-guzzling limousines and SUVs remained the transport mode of choice for the vast majority of participants. For the really "serious money," the road was left behind altogether in favour of a helicopter entry and departure to the small ski resort high in the Swiss...