And deeper emissions cuts like those proposed by the European Union – 20% below 1990 levels within 12 years – would reduce global temperatures by only one-sixtieth of one degree Celsius (one-thirtieth of one degree Fahrenheit) by 2100, at a cost of $10 trillion. For every dollar spent, we would do just four cents worth of good.
而像欧盟提出的更深层次的碳减排目标——即12年后比20世纪90年代降低20%——只能在付出10万亿美元成本的前提下，实现全球温度截止2100年降低六十分之一摄氏度（约合三十分之一华氏度）。这样1美元产生的效益只有区区4美分。