For decades, cities have trusted grey infrastructure to keep them safe. Concrete drains for floods. Asphalt for mobility. Pipes, walls, and channels engineered for a predictable climate. But the climate those systems were designed for no longer exists. As heatwaves intensify, rainfall becomes more extreme, and droughts last longer, the limits of grey infrastructure are being exposed. Drains overflow. Roads trap heat. Flood defenses fail once thresholds are crossed. And when they fail, they fail

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