[ChemicalWarfare]

>> So you understand that the amount emitted over time is not equal to the amount currently present?

I do, but you don't seem to since you came back with an attempt to quantify the "amount emitted over time"

my question was: >>> what percentage of CO2 in the atmosphere is attributed to human activity?

...and I even answered it myself :) ... it's ~4%

[mikeash]

Your 4% number is also based on emission rates. My number and yours are both nonsense for the same reason. You can't make the attribution by looking at emissions alone.