某些石油制塑料的生产效率极高，因此也有相对较低的环境足迹。

Production of certain petroleum plastics is very efficient, leading to a relatively lower environmental footprint.

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从效率的观点来看，“公地”应该被公有或私人所有制体系代替。

From the point of view of efficiency, the Commons should probably be replaced by systems of public or personal ownership.

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如果是在身份制社会，这就将损害全社会的资源利用效率。

In status system, it will undermine the use of resources.

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If the vehicle in the unfortunate circumstances of a collision, has to be able to maintain the security of the hydrogen which means more mass, which means a lot of the efficiency is being squandered What's the environmental impact of hydrogen production?

如果车辆,在碰撞中发生了不幸，要仍然能够保持氢气的安全性的话,意味着需要更多的质量，也就是说大部分效率被浪费了,制氢对环境有什么影响呢？

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