The following chart is largely self-explanatory:
Red: The actual rise of atmospheric CO2 from 1966 to 2006
Pink: The actual rise of human emissions within that 40 year timeframe (starting point at 321 ppm for comparison)
Blue: Human emissions multiplied by 24.41 to parallel atmospheric CO2 growth
Black: The human emissions slope as it would be if CO2 had stagnated in the atmosphere
Gray line: Accumulating atmospheric human emissions with a yearly retention rate of 0.56 — meaning that 44% is absorbed yearly, which contradicts the assertion that CO2 remains in the atmosphere for hundreds or thousands of years.
Data sources are from the US government’s Carbon Dioxide Information Analysis Center (CDIAC):
But here’s the trick: How do you convert gigatons of carbon into ppm so you can compare the human and atmospheric trend? Well, CDIAC informs you: Divide gigatons by 2.13.