[cbacba]

we lost a lot of plant species in that period of time that just couldn't survive with such low levels of co2. aren't you for biodiversity?

Of course you are assuming that 1) the warming is caused by ghgs and 2) that man has increased the amount of them. Considering that there isn't enough forcing to account for the change in temperature (not to mention other planets undergoing similar warming and not to mention that co2 concentration appears to lag historic records of warming) it would seem more plausible to accept the notion that co2 increases are in fact a symptom of the warming that is going on rather than the cause of it which means man may not be responsible for much of any of the added amounts. After all, as the temperature rises in the oceans, the amount of co2 present in them must decrease. Couple that with the realization that the number of unknown active subsea volcanoes could number in the millions, that's a lot of heat there. That's just one more factor in the growing list of unknowns that were ignored during the formulation of the ghg myth.