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人类目前所利用的煤、石油和天然气在地球上的蕴藏量是有限度的,也是不能再生的能源。但植物,是人类目前可以利用的另一种重要的,可以不断地再生的能源。人们已开始把植物称为绿色能源。
The amount of coal, oil and natural gas currently used by mankind on Earth is limited and can not be regenerated. But plants are another important and continuously renewable energy that humans can currently utilize. People have begun to call plants green energy.