环境保护主义者说，温室气体对黄河的死亡起了作用，但是，经济学家警告中国的减速可能导致不稳定性，甚至动荡。

Environmentalists say that greenhouse gases are contributing to the death of the Yellow River, but economists warn that a slowdown in China could lead to political instability-even chaos.

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几十年来，危言环境保护主义者一直警告说人类的厄运迫在眉睫，主要由于我们对于地球上自然环境系统的利用不可持续，且对其造成严重影响。

For decades, apocalyptic environmentalists (and others) have warned of humanity's imminent doom, largely as a result of our unsustainable use of and impact upon the natural systems of the planet.

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