Warming ocean water around Antarctica, by a maybe 2 to 5 degrees Celsius, could trigger that chain of events, Pollard says. That degree of ocean warming is not forecast for this century, but at the rate the planet is heating up, it seems inevitable at some point. But Pollard’s study indicates that the West Antarctic ice sheet won’t melt away too rapidly. He figures that will take at least 1,000 years, and more likely 2,000 to 3,000 years.
But instead of being reassured by this long time horizon, Pollard says, “I’d say I feel more nervous.”
That’s because there’s now a clear history showing this massive ice sheet has melted before, under conditions that the Earth may soon experience. And while the full effect may not unfold for thousands of years, it would transform the planet into a place we would not recognize today.
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