these people are some real idiots........try this experiment, put a bunch of ice in a glass and add water, then mark the level........let the ice melt.....is the water above or below the previously marked line?
A more accurate experiment.
Fill glass with water and ice. Set on floor.
Fill your cooler with ice, set on counter with drain opened to drain melted water into glass. Wait a few hours. Measure line.
Much of the ice that would melt under a GW scenario is on land. That said, there is no evidence that glaciers are melting at an alarming rate and that the oceans will suddenly rise feet instead of 1-2mm/year as they have been doing for the past several thousand years.