Sounds like the answer to this problem is to tap this source of methane and put it in the pipeline. Turn it into CO2 and heat somebody’s house. 7M Tons of methane can heat a few houses.
All you gotta do is light it. Where the CH4 - O2 mixture is in the combustible range, you'll get a few marsh lights. (In Siberia, who cares about marsh lights?) And CO2 and some water will result.
On the other hand, lets speed the production of CH4 up. It may help delay the ice age that awaits us.