The world’s biggest iceberg is on the move after more than 30 years being stuck to the ocean floor.
A23a, as it’s called, calved from the Antarctic coastline in 1986, but almost immediately grounded in the Weddell Sea to become, essentially, an ice island.
At almost 4,000 sq km (1,500 sq miles) in area, it’s more than twice the size of Greater London.
The past year has seen it drifting at speed, and the berg is now about to spill beyond Antarctic waters.
Who wants to do the exact maths to work out the sea level rise of all of this melting? My back of an envelope calculation gives me 4cm, but happy to be proved wrong! I did 1600km3 over 75% of 510,000,000km2