You should also research some of the existing methanotroph bacteria studies, there are some strains available without GM.

One of the most interesting is the Antarctic researcher who was studying the ice cores. He used some weird culture when his regular supply ran out, and found that every single core he tested was inbued with methanotrophs. They were dormant in the cores, but they were still metabolizing very slowly, and they where in all of them. This points to the major possibility that the "historical" high levels of CO2 everyone points to in the record, were actually methane gun events, that upped the methano's, then as the level dropped due to predation and conversion, we are left with the gas bubbles people are studying now, which show very high levels of CO2 before industrialization.

and as i posted before , the Ridiculously Resilent Ridge atmo high is still in place, we are getting a winter storm front right now in AZ. Gonna be 4 years soon, and we know about emplaced highs, we get one most every summer for 4-6 weeks.