能量污染和其它污染(如光污染，噪声污染，废气污染等)都一样，是由于人类活动造成的。
日常摄入的水、食物和各类能量与输出的污水、固体废物、空气污染物、能源和经过某种转化的物质相匹配。
A daily input of water, food, and energy of various kinds is matched by an output of sewage, solid waste, air pollutants, energy, and materials that have been transformed in some way.
消费者可能早就认识到生产商品所需的能量和产生的污染，但是他们如果知道为了生产一些日用品消耗多少水之后还是可能会感到惊讶。
Consumers may already be aware of the environmental impact of producing goods in terms of energy or pollution, but they might be surprised to learn how much water is needed to create some daily goods.
很容易知道原因：核聚变为太阳提供能量，也为一种近乎无限的无污染的电提供了可能。
It's easy to see why: nuclear fusion powers the sun, and it holds out the possibility of near-limitless electricity, without pollution.
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