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无污染性能源、清洁能源
environ.	non-polluting energy source Energy that is ecologically safe and renewable. The most widely used source is hydroelectric power, which currently supplies some 6.6% of the world's energy needs. Other non-polluting sources are solar energy, tidal energy, wave energy and wind energy. Most non-polluting energy sources require a high capital investment but have low running costs (可再生和生态安全的能源。使用最广泛的是水力发电，目前提供世界能源需求的6.6％。其他非污染来源是太阳能、潮汐能、波浪能和风能。大多数非污染性能源，需要高资本投资，但运营成本低。)