global warming - Geography Ebooks | TheGeoecologist

Question 1

How much would sea levels rise if all Antarctic ice melted?

Accepted Answer

Complete Antarctic ice melt would raise global mean sea level by approximately 58 meters (190 feet), according to BedMachine Antarctica data published in Nature Geoscience (2020). This includes ~52 meters from the East Antarctic Ice Sheet and ~5 meters from the West Antarctic Ice Sheet.

Question 2

How long would it take for all Antarctic ice to melt?

Accepted Answer

Total Antarctic ice melt would take centuries to millennia due to the immense thermal inertia of the ice sheet (26.5 million km³). However, irreversible commitment to multi-meter sea-level rise from West Antarctic collapse could be triggered this century under high-emission scenarios.

Question 3

Which cities are most at risk from Antarctic ice melt?

Accepted Answer

Shanghai, Mumbai, New York City, Tokyo, London, Jakarta, Lagos, Bangkok, Miami, and Alexandria face severe inundation risk. A 2019 Climate Central study using improved elevation data found 300 million people currently live on land threatened by 2-meter sea-level rise.

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