Notes on solutions: In the subdivision Euryarchaeota, uncultivated organisms in deep-sea marine sediments remove methane via anaerobic oxidation of methane stored in these sediments: methanotrophs can also convert methane  – see

The type of animal feed is a crucial factor in controlling the amounts of methane produced via enteric fermentation animals. AgResearch New Zealand is researching ways this can be reduced.

see Kelp: 

BUT  potential poising problems associated with  Asaparagopsis:

References and further reading