In many Indian homes, kitchen waste is simply thrown away. Vegetable peels, leftover food, and scraps head straight to the bin, while families continue to depend on LPG cylinders for cooking. But one IITian has found a way to turn that everyday waste into something far more useful: free cooking gas.

For the past seven years, Priyadarshan Shahastrabuddhe hasn’t bought a single LPG cylinder. Instead, he cooks using gas generated from food waste collected from his neighbour’s kitchen.

In his kitchen sits a biodigester — a system that........

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