Except that it has also been conclusively proven that CO2 concentrations have followed increases in temperatures, rather than leading/causing them. Moreover, there are uncountable organic ecological processes which would mitigate the situation and seek to maintain an equilibrium.
In short, that Malthusian declinist dog don't hunt.
In the past maybe, but you can't use the past as a template for the future, if underlying conditions have changed. Like, humans putting 60-70 million tons of CO2 into the atmosphere DAILY, more in a few days than all Earth's volcanoes emit in a year!
lying asshole