I'm curious, aside from indirect anthropogenic increases in CO2 emissions, how many ppm is directly attributable from burning fossil fuels to date? That should be easily calculable if we know relatively accurately how much of various fossil fuels have been burned.
I imagine the question is less straightforward since the ocean absorbs something like 2/3 of the CO2.
...just found this too, though I don't know what the 44/12 rule is. Ocean absorption I mentioned?
Quote:
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the Carbon Dioxide Information Analysis Center advise that 1 part per million of atmospheric CO2 is equivalent to 2.13 Gigatonnes Carbon. Using our 44 over 12 rule, this means 1ppm = 7.81 Gigatonnes of Carbon Dioxide.
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One source says humans release 36 gigatonnes per year.
This graphic is interesting:
