Vastly more people would die from starvation in a massive economic breakdown in Greece than will die as a direct result of climate change in the worst case.  Even if tides rise a full 11 meters like the most extreme estimates claim, that will still take 100+ years to happen.  This kind of thing has been happening to Venice for hundreds of years.  No one is going to drown because they can't manage to escape the rising tides.

Honestly, kids.  Try and keep the global threats in perspective.