The planet was practically covered in ice just a few thousand years ago.

几千年前，地球几乎全部被冰覆盖。

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'Geo-engineering plans to inject stratospheric aerosols or to seed clouds would act to cool the planet, and act to increase the extent of sea ice,' says Rasch.

拉施说：“地球工程计划将平流层的气溶胶注入到云层中，这将起到冷却地球的作用，并增加海冰的范围。”

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While 75% of our planet is covered with water, only about 2% is fresh water that comes from rivers, lakes, ice and snow.

虽然地球的75%被水覆盖，但只有大约2%是来自河流、湖泊、冰雪的淡水。

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To the extent the scientific evidence leads to a particular conclusion, the conclusion is that humans are modestly enhancing a natural warming cycle that fortunately rescued the planet from the Little Ice Age.

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Researchers say this back-from-the-dead trick has implications for how ecosystems recover from the planet's cyclic long periods of ice coverage.

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U.S. and global soil moisture improved throughout the 20th century as our planet warmed in its recovery from the Little Ice Age.

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