There is a glacier in Antarctica that is melting away and could completely collapse in as soon as  three years , but more probably within  150 years.   Thwaites Glacier in Western Antarctica is around 74,000 square miles, roughly the size of Florida, and from 2600 to 3900 feet deep.  This glacier has already lost a trillion tons of ice since 2000, with an annual ice loss that has doubled in 30 years.  It is also called the  Doomsday Glacier  for if it escapes into the ocean, after quick melting, the  sea level could rise by over two feet , according to  Ted Scambos .  That would doom places like Waikiki, and also New York City and Sydney, among a whole coastal range of cities around the world. Worse, if this begins to occur, then the entire West Antarctic Ice Sheet could go, doubling the sea level rise to 6 feet.  There is 8 times as much ice in the Antarctic than Greenland, and 50 times as much as in the mountain glacie...