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The air, the air, twas God who made the air,The air, the air, that all of us must share,Why should we be beggars when democracy's our heir,God made the air for the people. (with apologies to the great political song...:) But it makes a point. The other day I said I wanted to return to one or two things that Chris Huhne said about climate change. Apparently carbon trading is better than carbon taxing because, said Chris, the incentive of being able to trade away your surplus allowance and make some money is a bigger incentive than simply saving ...