Dutch architect Koen Olthuis responded to the rising sea level by designing a floating apartment building:
The Dutch are uniquely accustomed to dealing with fluctuating water levels; much of the Netherlands is below sea level, and vast swaths of land, known as polders, are continually pumped free of the accumulating rainwater that threatens nearby homes and buildings. The Citadel will simply rise and fall with the changing water levels, making it impervious to flooding, tides, and sea waters inching upward as a result of global warming.
Built atop a floating heavy concrete foundation, The Citadel will house 60 luxury apartments, a parking garage, a floating roadway, and boat docks. Each apartment will naturally have waterfront views via a garden terrace, and greenhouses will be interspersed throughout. But the greenest feature of the Citadel is its cooling system: submerged pipes will pump water throughout the structure to cool it, reducing its energy use by 25 percent compared to a conventional building.