The Keeling Curve is not a "Whoopee" graph, it is scaled properly to convey information.
Keeling's data was valuable and useful. The process of determining the origin of CO2 in the atmosphere is a complex process. Others have done it quite thoroughly. Your claim that Keeling failed by not including that information is simple bullshit.
Humans are responsible for almost every molecule of CO2 above the 280 ppm, pre-industrial level. Given that we are now at 420 ppm, humans are responsible for 50% of the CO2 currently in the air we breathe. You have made this 4% claim on multiple occasions but I have never seen you provide any supporting links. Let's see what you got. Something like this, that supports my claims
The increasing levels of carbon dioxide (CO2) in the atmosphere have become a major environmental challenge due to their contribution to global warming. The primary drivers of the increase in atmospheric CO2 concentrations are the combustion of fossil fuels, deforestation, agricultural...
www.mdpi.com
Water vapor is the dominant greenhouse gas but being a chemical engineer you understand that being a precipitable component of the atmosphere there is no way to change its level in the Earth's atmosphere except by changing the Earth's temperature, which, of course, we ahave been doing through the addition of another 140 ppm of CO2. Water vapor is the primary positive feedback to CO2's greenhouse warming. Thanks for the tip.