Sea level has been going up and down in the last millennia and while moving a camp wasn’t a big deal for our ancestors, moving today Venice or New-York is a different story. Sea level is currently rising at an accelerated rate due to the melt of land-based ice: glaciers, the Greenland and the Antarctic ice sheet. How high is the sea level going to be in 10 years, 50 years, 80 years, 500 years? How do we calculate how much the seas are going to rise?