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People might think they’re twins, but the North Pole and the South Pole are really more like distant cousins who,
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, at family reunions,
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, can’t believe they are related.

To visit the North Pole, you have to take a helicopter or plane that lands you on an ice runway just a few meters thick. Beneath your feet stretch several miles of water. Better hope the ice doesn’t crack.

To visit the South Pole, you land on another ice runway, but one solidly anchored to the bedrock beneath. This is why the National Science Foundation can build a huge permanent research station here. No chance you could fall through and drown.

Therein lies the contrast between the Earth’s poles: The Arctic is an ocean surrounded by land (Alaska, Canada, Greenland,
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, Scandinavia, Russia). The Antarctic is land surrounded by an ocean (the Southern Ocean). Those stark differences mean that the poles respond very differently to planetary changes.

Take this year’s seasonal fluxes in sea ice. When it’s summer in the Northern Hemisphere,
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, the Arctic’s ice cap melts back and shrinks. Meanwhile,
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, it’s winter in the Southern Hemisphere. That means that sea ice is growing around the fringes of the Antarctic continent, like a ring of hair encircling a bald pate.

Both poles set a record this September. Up north, the Arctic experienced the biggest loss in sea ice since satellites began watching in 1979

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