Think of an overheated car; now imagine that on a planetary scale.

想想过热的汽车，现在想象全球范围的过热情况。

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For humans to be intimately involved in many interconnected processes at a planetary scale carries huge risks.

对于人类而言，在行星尺度上被密切卷入许多互相连通的进程是冒着巨大风险的。

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Expose the surface of the ocean to an atmosphere with ever more carbon dioxide, and the gas and waters will produce carbonic acid, lowering ph on a planetary scale.

要是海洋的表面与含更高二氧化碳的大气层接触，那么水和气会产生更多的碳酸，在全球范围内降低PH值。

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For humans to be intimately involved in many interconnected processes at a planetary scale carries huge risks.

ECONOMIST: The geology of the planet

Its atmosphere is escaping like a comet but on a planetary scale.

NPR: NASA Sends Spacecraft to Pluto

And we also believe that Mars had planetary-scale oceans in the northern hemisphere.

NPR: Revisiting the Viking Missions to Mars