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.
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