What cities, deltas or whole countries will be lost? We hear directly from the scientists – from Scott Kulp & Benjamin Krauss at Climate Central. But we start with Dr. Jonathan Bamber. Why expert judgement jumped from 1 meter sea level rise by the year 2100 – to 2 meters, well over 6 feet higher seas. Brand new coastlines are possible by the end of this century. And a murky worry for all is something called “Antarctic instability”.