由于这种能源大部分来自化石燃料的使用，浪费食物可能导致不必要的全球变暖以及低效率的资源利用。
Since much of this energy comes from the utilization of fossil fuels, wastage of food potentially contributes to unnecessary global warming as well as inefficient resource utilization.
美国的交通基础设施亟需全面翻修，同时也存在很多优秀项目能够提高能源利用效率或增加替代燃料资源。
America's transport infrastructure is in need of overhaul (see article), and many worthy projects exist that could boost energy efficiency or alternative fuel sources.
这位在办公室设在北京的为美国自然资源保护委员会工作的大学生，经常到重庆帮助其提高能源利用效率。
The former college student, who works for the Beijing office of the U. S. -based Natural Resources Defense Council, often travels to Chongqing and helps the city improve its energy efficiency.
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