like it over the last 800,000 years?...we're already at 416 ppm, and at current FF burning rates, in 80 years we'll be near double the amount of CO2 currently in our atmosphere...pushing 800 ppm, and almost triple what it was when the glaciers receded...imagine how that will look on the graph (just get out your 'Sharpie' ;-)).
btw, the glaciers were formed when CO2 was at 180 ppm...they receded when the level was near 300 ppm...just think what 800 ppm will do to the glaciers we currently have...think it might have any effect on this planet's environment?...seriously...what do you think might happen?