If the observed increase in carbon dioxide since 1958 is the result of human activities, there should be a simple relationship between the rate at which we pump it out and the rate at which it goes up. The “Atmospheric CO2 concentration” display allows you to compare the observed concentration to that predicted from the known output shown in the “CO2 release rate” display.
The initial prediction from KISS is not very good; the model clearly overestimates how much CO2 should have gone up since 1958. However, this assumed that all the CO2 released by humans has ended up in the atmosphere and this is unlikely to be correct. Some carbon dioxide will have been absorbed by the oceans and soil whilst some may also have been taken up by increased plant growth. So KISS allows you to see what would happen if less than 100% of the CO2 stays in the atmosphere. Can you find a percentage that produces a good match between observations and data?
Given the closeness (or not) of the resulting match; is the hypothesis, that the rise in CO2 results from human activities, supported in your view?
