That’s the bad gas. Now for the good gas – Renewable Gas :-
https://tribune.com.pk/story/573418/renewable-energy-kesc-aman-foundation-to-set-up-bio-gas-plant/
https://www.woodheadpublishing.com/en/book.aspx?bookID=2862
https://pubs.acs.org/doi/abs/10.1021/nl4016655
Joanna Kargul’s team :-
https://solar.biol.uw.edu.pl/index.php/lab-team
https://www.eera-set.eu/lw_resource/datapool/_items/item_795/ampea_2013_kargul.pdf
Slightly questionable gas (from a biosecurity point of view) :-
https://sb6.biobricks.org/poster/biohydrogen-production-in-e-coli-a-synthetic-biology-approach/