Re: So, not just a question of...
"There is a solution; we have not looked at alternatives. We need to invest in exhaust scrubbers; this should prolong the life of diesel."
It won't reduce the CO2 load - and the problem with THAT can be summarised with "Look at what's happening under the Laptev Sea"
All that methane reaching the surface is a sign of the ice beds down below weakening - to the point where an earthquake could break them loose - Storegga-style.
If that methane clathrate bed bloops(*) at current atmospheric CO2 concentrations, there's a good chance the subsequent spike in oceanic CO and temperatures will set off others in a chain reaction that could spread rapidly around the globe. The last time that happened was called the Permian Extinction Event and paelentologists are still debating how fast that chain reaction occured as the fossil record turned so fast. Definitely less than a decade, possibly as short as a year.
And just to add icing to the cake: What happened then was that so much CO2 got into the atmosphere that it wasn't warming that killed off virtually all the land plants, it was acid rain. Almost all animals followed closely behind as food sources dried up and atmospheric oxygen levels plunged to 11%(**). At the same time the Seas went anoxic (red tides on steroids) as most aquatic animal life died off due to the low oxygen levels.
(*) Somewhere between 0.75 and 2 times our TOTAL CO2 production coming up as methane in one go.
(**) Humans (and mammals in general) have trouble surviving below 15-16%. Look up the short and long term effects of anoxia: They're _nasty_ (There is one ethnic group who have a mutation that may survive low oxygen levels - tibetians/nepalese)