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Temp+Co2+CH4

Notes:

When CH4 levels are plotted with temperature and CO2 levels, another strong correlation arises. It's tempting to say that since CO2 and CH4 are greenhouse gases, this correlation is a consequence of the greenhouse effect.

However, it's equally valid to suggest that CO2 and CH4 are products of biology and that the rate of biological processes, the amount of land participating in biomass production and the total amount of biomass all depend on temperature and that this is the relationship seen in the data.

There's more than enough data to unambiguously ascertain which hypothesis is valid, and whether or not, either or both can be excluded.