To what extent the sea level would rise if all the icecaps in the world melt due to Greenhouse Effect and the global warming?

No one knows for sure, but some estimates have been made and they are largely focused on Antarctica. The Arctic on the other end is not a major cause of worry, because there is no icecap as such and its ice floats on the Arctic Ocean. If it is melted, the sea levels would not be affected. In the case of Antarctica, the largest ice-covered landmass with about 90% of the world’s ice, the results for the mankind would be disastrous. This frozen continent’s ice has an average thickness of 2,133 meters. If all of it melts, sea levels around the world are likely to go up by about 61 meters. Then, of course, there is Greenland which would add another 7 meters or so to the sea levels. The levels could go further up by 2 meters as the mountain ranges like the Andes, Himalayas, and Alps are striped bare.
Overall, the oceans could swell up by about 70 meters and hundreds of coastal towns and cities like Mumbai and New York would be submerged.

More reading:
Greenhouse effect (Wikipedia)
Current sea level rise (Wikipedia)
Effects of global warming (Wikipedia)

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