美国人没有为其所造成的污染—特别是由于挥霍能源而造成的温室气体排放—付出完全的代价，意味着能源定价过低的情况在支撑着能源过度消费。
The fact that Americans do not pay the full price for the pollution – especially enormous contributions to greenhouse gases – that results from their profligate energy use means that energy is under-priced, in turn sustaining excessive consumption.