Saudi Arabia may be famous for medieval barbarism and oil, but the kingdom is rebranding as a futuristic ecotopia. The latest showcase of this unlikely vision is The Line, a mirrored city that’s 500m tall, 200m wide, and 170km long. The metropolis will purportedly have a population of 1.5 million people by 2045. The project is projected to cost up to $1 trillion. Future residents are promised “a civilizational revolution” with no cars, roads, or emissions. Underground trains will transport them from end-to-end in 20 minutes, and all amenities will be within a five-minute walk. The facilities will be vertically-layered…

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