00:00The size of Florida.
00:02Welcome to the 120-kilometer-wide Thwaites Glacier.
00:07Its more scary nickname is the Doomsday Glacier.
00:12When it melts, there will be a catastrophic rise in sea levels all over the world.
00:18Now, this Doomsday Glacier is melting incredibly fast.
00:23It sheds 50 billion tons of ice into the ocean every year.
00:28And it accounts for 4% of the 9 inches of sea level rise that's happened so far.
00:35Some scientists are predicting that the whole thing might melt in decades rather than centuries.
00:42But we don't even have a few decades to hang around, let alone centuries.
00:47So I'm going to show you what happens if it melts a whole lot sooner, in seconds.
00:53In just a few seconds, Thwaites has melted and flowed into the southern ocean that surrounds it.
01:00And from there...
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