What happens to all the ice floating on the Arctic Ocean if it melts? The shrinking ice will damage the livelihoods of indigenous peoples and threaten the survival of creatures like polar bears. But does it make a difference to sea levels? This video tracks what happens to ice in a glass as a simple analogy -- (there is a tiny difference between the behaviour of ice (which is made up of fresh water) in a glass of fresh water and on a salty ocean but I've ignored it, like many studies have done) NASA picture of the Earth at the start.

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