Absolutely. Excreta from billions of people and the billions of livestock can be used to make biogas.
The Indian pioneer of biogas production from human excreta, Dr. Bindeshwar Pathak, founder of the Sulabh Sanitation Movement in India, has been named the 2009 Stockholm Water Prize Laureate.
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As long as there is gobar and garbage, there will be gas. Better to harness it and burn it into less harmful greenhouse gases unlike the methane they produce, which is far more harmful than CO2. In that sense, it is renewable as a source of it.