https://www.bundestag.de/resource/blob/666002/21b43e1b155051227ef2981acd52c254/19-16-292-C-Corbyn-data.pdf
It (man made) does not exist because it is not man's CO2.
In the long run CO2 levels are an EFFECT NOT A CAUSE of changes in Climate / temperatures. Sea temperatures rule CO2 as the oceans hold 50times more CO2 than the atmosphere. If the sea warms, CO2 is released(like warming a glass of fizzy drink) and if it cools it absorbs CO2 from theair. This happens on a daily/weekly/monthly/yearly basis and on averageCO2 in the whole atmosphere stays around for a few years before going back into the upper levels of the ocean or into the soil; CO2 levels in these relatively small changes LAG behind temperature changes. [REF.1,2,3,4,5,8]On longer time scales extra CO2 emitted from the sea surface in warm periods gets swallowed up into the cold deep ocean by currents off e.g.Greenland and emerges 500-800 years later in the air over the Pacific etc.after a long deep sea trek - see below. So, the amount of CO2 in the atmosphere, over the long run, is an effect, and not a cause, of temperatures and lags behind the climate by about 500-800years