I n the back streets of Kenya’s capital, Nairobi, where children play football on vacant dirt blocks beside apartment blocks, a concrete building stands behind a wobbly corrugated iron fence. It seems an unlikely place for an agricultural revolution.

The half-built building is flanked by a 10m-long greenhouse and from it emerges Winnie Wambui. The 24-year-old is an engineering student, business owner and entrepreneur – and her crop is black soldier flies.

Food waste collected from local markets is fed to the fly larvae, which can eat double their body weight in a single day. It’s a low-cost waste management solution, with added benefits. Frass – matter including insect poo and exoskeletons – extruded from the larvae is sold as fertiliser and the larvae themselves become a high-protein m

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