Ice on water melting has no effect on sea level. Ice on land melting into the sea is what they're concerned about. Greenland alone (science.howstuffworks.com) would add 20 inches of water to the world's seas.
Ice on water melting has no effect on sea level. Ice on land melting into the sea is what they're concerned about. [Greenland alone](https://science.howstuffworks.com/environmental/earth/geophysics/question473.htm) would add 20 inches of water to the world's seas.
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