It's the same here really since most people live on the coast so yeah most of the population would be a few meters above seal level.
We've lost so much land and people argue about reclaiming some of the land, some places have lost hundreds of meters in on the last decade. We don't have any rock here it's all sandstone.
We're as big as Long Island but I think we may be in trouble if we don't start rebuilding the coast and cutting carbon emissions of course.
As a person who lives on a very low island, average 20m asl, climate change is going to be rough :{