Two repurposed concrete grain silos in Copenhagen converted into modern office space, an example of the city's adaptive reuse of old industrial buildings.

Sustainability you can feel: Copenhagen’s Nordic take on green tourism

If you want to understand why Copenhagen is so often called one of the most sustainable cities in the world, you have to look past the slogans and into the showers, the warehouses, and the old shipyards. At one hotel, every room has a futuristic shower built on water-recycling technology first developed for a Mars mission, regulated by a Nest-like dial at waist level. Across town, a small urban warehouse grows tens of thousands of kilos of gourmet mushrooms on a fraction of the water that traditional farming demands, feeding some of the city’s best restaurants. In a former port district, architects are deliberately shrinking apartments and reusing ammunition stores and grain silos rather than tearing them down. Each project sounds like a novelty on its own. But together they hint at a single Nordic idea about how a city, and the people who visit it, might choose to live with less.