1.3.5

As such resources are depleted, human ingenuity
can often find substitutes.(當資源被耗盡,人類機伶的發現替代品)For example, during this
century a mix of renewable energy resources such as
wind, the sun, flowing water, and the heat in the
earth’s interior could reduce our dependence on nonrenewable
fossil fuels such as oil and coal.(舉例來說:人類在這幾世紀間找到了許多可再生能源,有風力,太陽能,水力,地熱以減少對石油和煤炭等不可再生資源的依賴性) Various types of plastics and composite materials can also replace certain metals.(許多種類的塑膠和合成材料也可替代許多金屬) But sometimes there is no acceptable or affordable substitute.(但有些還是不能當做替代品)