水电在美国和其它一些国家的能源结构中占有显著的地位，但水坝对环境造成损害的问题已经严重地限制了它的增长。
Hydropower plays a significant role in the energy mix of the United States and several other countries, but environmental concerns about the damage caused by DAMS have severely limited its growth.
其次受到沉重打击的，是那些大宗商品生产国，比如拥有丰富能源资源的俄罗斯、伊朗、尼日利亚和委内瑞拉，这些国家一直面对着巨大的社会和人口结构挑战。
Second hardest hit are those commodity producers that have always faced big social and demographic challenges, such as energy-rich Russia, Iran, Nigeria and Venezuela.
默克尔还强调国家的能源供应链需要重建新结构，要以可再生能源，效率提高快和重建整个电网为基础。
Merkel also stressed that the country's energy supply chain needs a new structure, based on greater investment in renewable energies, efficiency gains and overhauling the electricity grid.
发达国家的能源消费结构中，石油所占比例很大。
Developed countries, energy consumption structure, a large proportion of the oil.
我国油、气等清洁能源在消费结构中所占的比例不仅远远低于发达国家，比世界平均水平低43%，甚至比印度还要低20%。
China's oil, gas and other clean energy in the proportion of the consumption structure is not only far lower than developed countries, even 43% lower than the world average and 20% lower than India.
日本是一个能源紧缺的国家，而发电能源结构经过了一个变化过程。
Japan is a country short of energy, while the energy mix for power generation experienced a changing process.
由于影响因素的复杂性，国家能源消费结构的研究大多是以简单的比例关系结合定性分析为主，缺乏定量评价的客观依据。
The researches on national energy structure are based on the simple ratio relationship and qualitative analysis for the complexity of affecting factors.
由于影响因素的复杂性，国家能源消费结构的研究大多是以简单的比例关系结合定性分析为主，缺乏定量评价的客观依据。
The researches on national energy structure are based on the simple ratio relationship and qualitative analysis for the complexity of affecting factors.
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