A company in southern India has come up with a viable way for poor households to help themselves.
The locally made biogas plant, filled with bacteria found in the stomachs of cows, silently and odourlessly converts food waste into gas.
More than 20,000 homes in Kerala have installed the handmade plant, and the money they save pays off the machine's cost within three years.
Al Jazeera's Tarek Bazley reports from Thiruvananthapuram.
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