The Federal Energy Regulatory Commission ordered the dam removed after concluding that the environmental and economic benefits of a free-flowing river outweighed the electricity generated by the dam.
For decades, scientists have pumped electricity into piezoelectric materials for use in environmental sensors, speakers and other devices.
几十年以来，科学家们已经能够将电能灌入压电材料，以用于环境传感器、扬声器与其他设备。
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Ethiopia is building three DAMS, two of them large and one controversial, for environmental reasons; and Egypt will take some of the electricity generated, via Sudan.