Nuclear waste buried underneath the ice in Greenland in a Cold War-era bunker is at risk of being exposed, scientists fear, due to global warming.

Radioactive coolant, thousands of gallons of sewage and diesel fuel, and tons of PCBs – a chemical coolant, banned in 1979 - were abandoned at the US Camp Century base when it was decommissioned in 1967.

The Americans left the base nearly fully intact, under the assumption that it would be buried forever under accumulated snowfall.