Greenland is currently losing mass in two ways; surface melting with resulting runoff and iceberg calving from marine terminating glaciers. Over time we can expect some of these glaciers to retreat, pull their feet out of the water and prevent the second of these two forms of mass loss. We need to be careful extrapolating trends when we have recent to believe processes may change.I'll also add that elevation feedback is likely to become more important as we reach the ice sheet's tipping point. The ice sheet is only there today because it has its head in the clouds, it's a relic of the last
