Christian Science Monitor: For those who think the battle over US carbon emissions legislation is already in full swing, this past week was a reminder that it’s just beginning. The central debating point: the numbers. How much will it cost American taxpayers to curb US carbon-dioxide emissions? Or, conversely, how much would it cost to just drop the blinds, turn up the air conditioner, and not do much at all? The answer to the question of economic impact – far more than the issue of polar-bear survival – will …