Actually water vapour is the biggest culprit by far. It is the one noone recognises as a GHG but it is the worst. We use and waste water like there is no tomorrow. But it is precious and we need to consider how our profligate use is anthropogeneic as well. What we should be doing with it is actually to creat a national grid like the electric asupplies, and then use excess electricity to pump water into hydrolelectric dams for storage purposes. We should not be wasting lithium on batteries to store excess wind power, we should use water. BTW: most methane lasts 10 years max in the atmosphere. What we should be doing is cap landfill and sewage works to capture the methane and burn it for fuel. they do this successfully in Amsterdam, so why not here in UK? On a more sombre note, why not use crematorium flue output for local heating. I for one would happily donate when my time comes. My local authority has no incinerator for burning waste, so it is shipped abroad at vast environmental cost. We should be burning plastic and paper waste and captuing the CO2 etc properly. The technology is here today, but the investment is not. I am disgusted that my waste bin each week is 85% filled with useless packaging that I would dearly love to recycle for the planert, but cannot, there are things that I can recycle only by transporting them to the landfill site, such as batteries, but it is impossible on a mobility scooter, and a car journey would totally negate the carbon footprint gain.