Slide 4 in this series.
The CO2 as measured at Mt ?? on the right bears littel resemblance to the human emissions increase in 2000 on the left.
Since not enough is known about the natural emissions of CO2, not as much as the emissions from human activity, the analsys by Dr Salby is quite relevant to the detemination of what the carbon cycle is.
NEXT: Examining volcanoes as a strong natural source of climate change is next.
These links are the topics for this section.
Modelling Temp Natural Factors
Earth and the Science of Radiation
Milankovith Overlapping Cycles