petroleum substitutes 中文意思是什麼
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These examples help explain why most environmental scientists believe that over the next few decades, the danger of degradation and exhaustion is greatest for potentially renewable resources, not nonrenewable resources ( except for petroleum and perhaps a few scarce minerals for which we can ' t find economically and environmently acceptable substitutes )
這些例子有助於解釋為什麼大多數環境科學家相信在今後幾十年內,可再生資源被退化和枯竭的危險性是最大的,而不是不可再生資源(石油,還有少數幾種我們未能找到經濟和環保的代替品的稀有礦物除外) 。
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