摘要
由于全世界煤、石油和天然气等化石燃料的储备逐渐枯竭，能源计划人员和政府都在努力寻找能够维持国家经济发展的能源。而国际社会对污染和温室气体的关注将化石燃料的衍生物排除在外。
As reserves of fossil fuels such as coal, oil and natural gas are depleted around the world, energy planners and ,governments are searching hard for energy sources that could sustain economies well into this century. International concerns about air pollution and greenhouse gases are ruling out derivatives of fossil fuels.
