先锋植物种子的增加，被猎杀的动物以及用于建筑和燃料的树木系统的变化是环境退化的证据。

Increases in seeds from pioneer plants and systematic changes in the animals hunted and the trees used for construction and fuel are evidence of environmental degradation.

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一些人认为解决环境问题的最好方法之一是增加汽车和其他交通工具的燃料成本。

Some people think that one of the best ways to solve environmental problems is to increase the cost of fuels for cars and other vehicles.

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我们可能不会看到生物燃料使用的增加——我的意思是，在我们找到方法以更低的成本、更快的速度和更少的环境成本生产它们之前，它们不会取代化石燃料。

We probably won't see an increase in biofuel use—I mean, they won't replace fossil fuels until we can find ways to produce them cheaply and quickly and with less cost to the environment.

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