Will the countries closest to the Ice RIng be effected the most by global warming.?
What "Ice Ring"?
Yes --- as a result, there may be gaps melted in the Ice Ring that will allow the Oceans of the World to drain out over the Edge. That's how Jesus will solve the sea rise problem.
No. Haven't you heard the aphorism "A rising tide lifts all ships"? There's a reason for why that's an aphorism. It's because it's literally true.
Maybe they will fatten up from all the food they will be able to grow, first time in about 600 years.