In almost all parts of rural India- north, south, east and west- wise villagers have been making use of this type of bio-gas for cooking for centuries.
The answer that B9 is proposing is a coastal cargo ship that combines massive carbon-fibre DynaRig sails - such as those used on the superyacht, the Maltese Falcon - with an engine that runs on bio-gas made from food waste using a process called anaerobic digestion.