Greenland's massive ice sheet may have melted by a record amount this year, scientists have warned.

During this year alone, it lost enough ice to raise the average global sea level by more than a millimetre.

Researchers say they're "astounded" by the acceleration in melting and fear for the future of cities on coasts around the world.

One glacier in southern Greenland has thinned by as much as 100 metres since I last filmed on it back in 2004.

https://www.bbc.com/news...nce-environment-49483580