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。
2
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.