Worldwide food production requires around 30% of the total soil available, 20% of fossil fuel energy and a major part of the fresh water flow3.

世界粮食生产大致需要30%全球土地，20%化石能源和大部分的淡水流量。

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That is paltry compared with the nation's total electricity capacity of over 1m megawatts: but the Energy Department says at least 7,000 megawatts from CSP plants will be available by 2020.

虽说该数量与全国1百万兆瓦的总电量尚不足一比，但是能源部预计，2020年CSP电站至少能提供7000兆瓦电力。

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The U.S. Department of Energy says in the seven years that hybrids have been available here, the total amount of gasoline saved adds up to less than the amount the United States imports every day.

NPR: The Prius Rules Hybrids �� but Is Interest Falling?