I got inspired by your calculation to fact check the article's claim of the 2.2mm see level rise. They apparently base this on the reported melting of 600 Billi

I got inspired by your calculation to fact check the article's claim of the 2.2mm see level rise. They apparently base this on the reported melting of 600 Billion tons of ice as stated in the article. 600 Billion (metric?) ton = 600000 Billion kg (or liter water) = 600 km3 This doesn't quite add up. I wonder where they got the 2.2 mm from ..