Fresh predictions about climate change prompt news@nature.com to ask what we know about the future of our oceans.

The polar ice caps may melt far faster under the pressure of global warming than experts previously thought. New predictions suggest that, without efforts to curb the rise of greenhouse gases, the world’s ice sheets could retreat farther by the year 2100 than they have in the past 130,000 years, leading to a huge rise in sea level.

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