19 November

The Greenland ice sheet is currently losing about 30 million tonnes of ice every *hour*. Meanwhile the deep ocean circulation in the north Atlantic is slowing, some say it may collpase already from next year. (Melting Greenland ice stops the circulation, with fresh water changing the water density.) That circulation brings warmth to the North, from the South. If that were to occur, the northern hemisphere may enter an ice age, with ice up to 3 km thick over the existing land area.