Overwhelming evidence collected during the filming of Frozen Planet shows the speed with which climatic changes are occurring. The movement of the glaciers in Greenland is a prime example of this. The Greenland glaciers are the world's second largest ice sheet. Using extraordinary time-lapse photography, Meltdown is able to show how they are moving towards the sea - at an astonishing rate of 120 feet a day, almost fast enough to view with the naked eye. With access to the Poles' most extraordinary locations and featuring interviews with leading scientists, Meltdown looks for definitive answers to some of the most pressing questions mankind has ever faced.