Second, immediate carbon cuts are expensive – and the cost significantly outweighs the benefits. If the Kyoto agreement had been fully implemented throughout this century, it would have cut temperatures only by an insignificant 0.2°C (0.3°F), at a cost of $180 billion every year.
其次，立即降低碳排放非常昂贵——其所需的成本远远超过了相关的收效。如果本世纪《京都议定书》彻底得到落实，它只能使温度降低微乎其微的0.2oC（合0.3°F），而每年却必须付出高达1800亿美元的代价。从经济的角度讲，《京都议定书》每投资1美元只能产生约30美分的效益。