Greenland ice sheet caught in feedback loop, melting fast

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A new study published in the Proceedings of the National Academy of Sciences of the U.S. claims that the massive Greenland ice sheet is on the brink of a major tipping point.

The study's authors say enough ice to raise the global sea level by more than a meter is probably already doomed to melt from Greenland in the next few decades.

RUNDOWN SHOWS:
1. Animated zoom sequence, from global map to Greenland, Jakobshavn highlighted
2. First half of sequence showing Greenland from space, temperatures rising, then
3. 2nd half of seq: ice melting into rivers, into oceans, ice receding dramatically
4. Finish space view, start cutaway side-view sequence, show cutaway view of Greenland
5. … as the ice sheet melts at the bottom, it drops in height, also reduces in width
6. Final part of cutaway sequence showing ice melting from top and bottom

VOICEOVER (in English):
The Guardian reports that a new study of the ice-sheet heights and melting rates in Greenland's Jakobshavn basin shows that the Greenland ice sheet is on the brink of a major tipping point.

Rising temperatures caused by the climate crisis have already seen trillions of tons of Greenland's ice pour into the ocean.

Melting its ice sheet completely would eventually raise the global sea level by seven meters.

The prime suspect for this surge in melting in Greenland is a vicious circle in which melting lowers the height of the ice sheet, exposing it to the warmer air found at lower altitudes, which causes further melting.

Study co-author Niklas Boers says the findings show destabilisation of this ice sheet is under way, and might already have passed the tipping point.

Boers said the findings suggest there will be substantially increased melting in the near future.

Ice equivalent to one to two metres of sea level rise was probably already doomed to melt, though this would take centuries, and melting the whole ice sheet would take a millennium.

SOURCES: The Guardian, The Independent, Phys.org
https://www.theguardian.com/environment/2021/may/17/greenland-ice-sheet-on-brink-of-major-tipping-point-says-study
https://www.independent.co.uk/climate-change/news/greenland-ice-sheet-melting-study-b1849067.html
https://phys.org/news/2021-05-greenland-ice-sheet.html