Buried under the North Sea, there are clues to the near-future behaviour of a warming Greenland: you will find hundreds of immense valleys below its bottom muds, carved by rivers of meltwater running beneath the ice sheet that covered Northern Europe towards the end of Earth’s last major cold phase.
Although known for some time as “tunnel valleys” (as they were incised under the ice sheet), only in recent years their true scale has become apparent. Read more on BBC