> It completely leaves out the temperature changes in the 20th century and how there were warming and cooling periods despite steady increase in CO2, which quite obviously means there are stronger mechanisms involved (if there was cooling despite CO2 increase in the 60s/70s).
The second graph shows that the warming/cooling is seasonal and that the overall trend has been up, in-line with CO2 levels. I don't understand what you don't understand about the second graph (your question is confusing, aside from explaining how seasons work on earth).
The second graph shows no temperatures at all, it's CO2 ppm / year.
> the overall trend has been up, in-line with CO2 levels.
That's simply not true. If you have more than a decade of cooling with steady increase of CO2 and recently more than a decade of steady temperatures with sharp increase of CO2, it's obvious that there are other factors involved.
> I don't understand what you don't understand about the second graph
You should take a closer look at it.
This just documents increase in atmospheric CO2 since 1970 and theories about what effects it might have. It completely leaves out the temperature changes in the 20th century and how there were warming and cooling periods despite steady increase in CO2, which quite obviously means there are stronger mechanisms involved (if there was cooling despite CO2 increase in the 60s/70s).