如果没有二氧化碳，地球将冻结。

Without carbon dioxide, the planet would freeze over.

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然而这些区域由于多余温暖而不可能存在冻结的二氧化碳，然而要有纯净的不含盐分的水出现的话，这里的气温有显得太低。

However the sites are too warm for frozen carbon dioxide, and in some regions too cold for pure, non-salty water.

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大量的二氧化碳曾经使火星的气候变得温和，并且目前在火星上仍然可能存在着二氧化碳。 在冻结的泥土和极地冰盖中还可能存在着水。

Much of the carbon dioxidethat once warmed Mars is probably still there, in frozen dirt and polar icecaps, and so is the water.

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