They could always build down, or up, or just reclaim more land from the sea.
I'd be more worried about completely land-locked countries, or ones who (unlike the Netherlands) don't have experience reclaiming land from the sea.
I'd be more worried about completely land-locked countries, or ones who (unlike the Netherlands) don't have experience reclaiming land from the sea.
Building skyscrapers on former swamps is indeed difficult.
However at least my local city council has understood that taller buildings is the way to go.