[ljf]

Don't forget what methane breaks down into... Water vapour and co2. So it's not like it breaks down and is no longer an issue n

[chrisco255]

Yeah but that CO2 is already part of the ppm that is measured. And water vapor of course, has the ability to cool or heat depending on the position in the atmosphere and amount of particulates for it to condensate on (to form clouds).

[strainer]

You shouldn't formulate the system like that - without any proportion. The proportions are what matters.