Iranian Choopan dairy has churned out what may be the world’s largest tub of ice cream.

One of two continent-scale ice masses on Earth, the Greenland Ice Sheet is the largest body of ice in the Northern Hemisphere. Almost 80 per cent of Greenland's landmass is covered with ice.

In many of the world's biggest ice cream markets appetites have been flagging for traditional take-home tubs. Consumers are worrying about the sugar content and there's a lot of competition.

During the past billion years, the Earth's climate has fluctuated between warm periods - sometimes even completely ice-free - and cold ... a brief respite from the big chill, but this was followed ...