*9.1.1 Production of renewable energy*

Biomasses are renewable energy creation inputs, and AD is used for biofuel (biogas, biohydrogen, biomethane, *etc.*) production [152–154]. Work with watermelon waste for bioethanol and biomethane production reported biogas yield at 581 ± 11 mLN/gVS [155]. Biogas may be used as is or converted to higher-quality biomethane [156, 157]. One study subjected cassava peeling residue (CPR) derived from 1000 kg of cassava root to AD. Output biogas provided sufficient energy to process the 1000 kg root into flour, gari, and starch [158]. Biogas canceled the global warming potential of fossil energy otherwise required for the production of these products, hence contributing to climate change mitigation.
