Saving or displacing barrels for 25 bucks rather than buying them for over a hundred, adds up to a $4 trillion net saving counting all the hidden costs at zero. So to get mobility without oil, to phase out the oil, we can get efficient and then switch fuels.
每桶油能省下25美元 而不再花去一百多元钱 忽略隐性成本的话 净节约额将达到四万亿美元 所以为了让交通业摆脱对石油的依赖 终结交通的石油时代 我们需要增加效率，并改变能耗方式