There's another interesting approach to the cow-fart problem, this being methane capture for biogas production suitable to run engines from manure storage. With

There's another interesting approach to the cow-fart problem, this being methane capture for biogas production suitable to run engines from manure storage. With current technology it becomes profitable starting from a population of around 120 cows, at which it supplies about 17.5 tons of (compressed) biogas which is sufficient to run a common-sided tractor for around 1000 hours. This is currently being tested in a pilot project by New Holland on 20 farms in Germany, France and Italy. There are other similar projects in different states of development, the mentioned one should become commercially available in 2024 or possibly this year. Source: Land Lantbruk #5 2023-01-27 pp 20-21 (lantbruk.se - farmer's weekly in Sweden)