The most comprehensive economic meta-study shows that total future climate impacts justify a tax of €0.012 per liter of petrol ($0.06 per gallon in the US.) This is dwarfed by the tax that many European countries already impose, and it is much less than in the European trading system.
但是这并不能够改变大多绿色技术低效性的事实。大多数综合经济元研究显示考虑到未来整个的气候影响，应该对每升汽油征收0.012欧元的税（在美国是每加仑应征收0.06美元的税）。这远远低于与许多欧洲国家已经征收的税，并且比欧洲贸易体系中征的税要低得多。