Living bridges and supper from sewage: can ancient fixes save our crisis-torn world?

From underground aqueducts to tree-bridges and fish that love sewage, indigenous customs could save the planet – but are under threat. Landscape architect Julia Watson shares her ‘lo-TEK’ visionOn the eastern edge of Kolkata, near the smoking mountain of the city’s garbage dump, the 15 million-strong metropolis dissolves into a watery landscape of channels and lagoons, ribboned by highways. This patchwork of ponds might seem like an unlikely place to find inspiration for