Hi again Giancarlo
A new day heeh?
From what i've heard, they have taken ice and analyse the co2 trpped inside of them by falling ice but i've also heard that since the last ice age we have never seen such high concentrations of them. Although as you said earth has had more co2 disperse in the atmosphere, they have been trough thousand or million year long processes, what we have done, we have just sped it up, increased the rate and speed at which it is happening. Mild, yes compared to the past as i said happened during a large span of earths timelime.