The “SS Ingels” overlooks yet another prime example: CopenHill, a BIG-designed skiing slope-cum-hiking trail that occupies the pitched roof of a low-pollutant waste-to-energy power plant. At once fun and functional, it exemplifies Ingels’s self-described “hedonistic sustainability” point of view. “Hedonism is about hot showers while sustainability is about cold showers,” he says. “But somehow, when you integrate the two, you have a building or city that’s more environmentally friendly and therefore more enjoyable to live in.”

“Utopian pragmatism” is another term Ingels uses to describe his work. “A utopia is a place so perfect that it can…

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