I see, at first it is air filled, and gradually as the pressure mounts with the CH4 content, you pass the lower explosive limit(at which it can function as a 'b

I see, at first it is air filled, and gradually as the pressure mounts with the CH4 content, you pass the lower explosive limit(at which it can function as a 'bomb') - time goes by - and you pass the higher explosive limit(at which point it can not propagate an explosion front - safe at last). Unless this was well controlled/monitored - I would tend to be averse to such a potential poop explosion. Even a small one would place a coating of poop, bacteria, degradation products over all surfaces - you as well!. How often do these poop 'pops' occur in China/India? Methane is one of the worst greenhouse gasses, over 25 times as bad as CO2 in terms of heat trapping. Do they build them with purpose built rupturable membranes or a diesel exhaust flapper valve? Or do they pipe them to a central gas storage system - like our house gas in reverse. All retrograde steps, all roads must lead to electricity by sun/wind/geo/sea/etc as soon as possible. We need to heat/cool/drive/fly/cook/etc with electric power alone at the same time. No more coal/gas/oil/trash wasted for heat/electricity/drive/fly/cook or we will face inexorable mounting climate extremes to the point where the sea is ~~ 300 feet deeper and all former sea ports are under 300 feet of water. I suggest buy inland dwelling sites on the 300 foot aquacline so your heirs will be enriched - those that survive it??