The CO2 produced from methane is much the same as burning fossil fuels. Methane is used to generate (dirty) hydrogen for the Haber ptocess where hydrogen and nitrogen are combined at high temperature and presure to produce Ammonia.
There is so much process CO2 that could be used (but the gases would need to be ‘scrubbed’ and further purified far more than that from methane usage. Think here every power station, cement works, etc.
The Haber process requires very much refined feedstock as the catalysts must not be ‘poisoned’, so it is the easier way to go.
The most effective way to absorb CO2from the atmosphere is probably by photosynthesis – but the human race is destroying forests at an alarming rate. How more stupid can the human race get? It is a bit like ‘burning your bridges’,IMO.
450ppm might seem miniscule to you but in the scenario of heating the whole planet, it is far from miniscule. Think here that CFCs (although in ppm, too) were totally responsible for destroying the protective Ozone layer in the atmosphere. If CFCs had not been banned, and had been continually released into the atmosphere at an ever increasing rate, there would now be a huge problem for life on Earth. That problem took only a few years to be diagnosed and stop further emissions, but the Ozone layer has still not yet recovered.
Nitrogen, the atmospheric component for the Haber process happens to be about 800,000ppm of the air that we breathe – nearly 2000 times more abundant than CO2.
Air is liquified to produce pure gases but do we really need to process 2000 times the volume for each volume of CO2, when a feedstock of a thousand (and more) concentration is available from current gas streams? I think it is either in Spain or Portugal where electricity generation exhaust gas (or some other industrial process) is being used for CO2 capture. Not sure what they do with the captured CO2, but likely used in industry/agriculture in some way.
Edited By not done it yet on 21/09/2021 09:06:27