The center of Greenland is below sea level and covered by about two miles of ice. Perhaps there could be a sudden collapse from below and two mile high icebergs

The center of Greenland is below sea level and covered by about two miles of ice. Perhaps there could be a sudden collapse from below and two mile high icebergs strand somewhere along Florida's coast? Sadly I am rather pessimistic but I learnt something from my wife's cancer: we all die sooner or later, so in a special way it doesn't matter if humanity is dying. I do hope for my children that we find a way to salvage ourselves. Perhaps world-wide carbon capture and a giant freezers where neccessary?