"problem that was CAUSED by the developed world. "

I know some here think that the sun rises and sets especially for them, but the trends shown in the plots presented by Wolfgang would indicate the PROBLEM is more than just the CO2 emmissions of industrial nations. Or will someone propose that there was excessive industry between 1000 and 1200 CE? Or would it be 800 to 1000 that was such a greenhouse gas producing time?