Biofuels are even less efficient, costing more than $300 per ton of CO2 avoided, while doing just over one cent of good per dollar. And solar takes the absolute prize, costing more than $800 per ton of CO2 to do less than a cent of good per dollar spent.
生物燃料的效率更差强人意，每减排一吨二氧化碳耗资超过300美元，1美元投入所起作用的略高于1美分。绝对高价的当数太阳能产品，每减排一吨二氧化碳耗资超过800美元，1美元投入所起的作用还不到1美分。