@humy said
So do you agree that the most recent carbon dioxide level increase is mainly man made or not?
Sure, but when is your timeline? You don't seem to want to accept CO2 is not the bogeyman. Let me give you some facts to consider.
During the Ordovician period, the concentration of CO2 in Earth's atmosphere was about eight times higher than today. It has been hard to explain why the climate cooled and why the Ordovician glaciations took place.
CO2 fluctuated between about 180 ppm during ice ages and 280 ppm during interglacial warm periods. We know from ice core samples that the CO2 lagged behind the temperatures so CO2 was NOT the cause. It was the effect of warming.
When the earth warms some of that CO2 will come from the oceans. If you can show that CO2 increased more than would be naturally expected and a correlating bump in temps or sea level I will look at it. If there is, a peer reviewed article must exist to confirm it.
Edit: Look up this- Figure 1, FAQ 2.1, IPCC Fourth Assessment Report (2007), Chapter 2
Notice how CO2 lagged behind methane before the industrial revolution and the clear pattern. Can you explain it?