They have been expectiing it for some years. Just last week there was only a slim area of ice holding the whole thing together. Yesterday it apparently broke off! The icebergs are huge and will make sailing treacherous as it will take a while for them to melt. Also there will be nothing to stop the rapid movement of the glacier that caused the ice sheet to form. The sheet held it back before but not now, it will go straight into the sea.This is a very scary situation and very little that can be done. Although the sheet per se is not expected to cause a rise in sea levels as it was over water the new progression of its mother glacier will and quickly too I would imagine. There are many coastal cities that are going to need a system to keep them dry. Venice is getting there and needs to as it is under some water for at least a third of the year. Filks have to walk on wooden platforms on flood days!