Your beloved isotopes can actually be from multiple sources, not just people.
Forest fires by lighting,
Different isotope ratio than fossil fuel burning.
naturally combusting coal dust,
Completely insignificant
volcanic activity
Tiny contribution, tracked very well and taken into account.
and many others.
If it comes from the biosphere, it has a different isotope ratio than fossil fuel burning. If it doesn't, it's insignificant in quantity.
Again, smart people have taken all this into account, despite what your conspiracy blog told you. The isotope ratios show that the increase in CO2 is almost all due to human activity.
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