双语趣听精彩世界 第118期:清洁能源来之不易

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　　清洁能源来之不易

　　If all the world's theoretically recoverable shale¹ gas could be developed, our supply of clean-burning natural gas would expand 47 percent—lowering both greenhouse gas emissions² and energy prices.

　　Bloomberg Businessweek says the hitch³ is that the process for extracting shale gas, called hydraulic⁴ fracking, sucks up as much as 25 million liters of water for each well.

　　A report from the Washington-based World Resources Institute shows that roughly 38 percent of the world's shale gas and oil lies buried beneath water-stressed regions. This means that extraction efforts will be difficult and expensive, as well as economically and environmentally risky⁵.

　　The situation is especially true in China.

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