CO2 has not gone "way off the graph." That simply is not true.
The norm through geological history has been around 3000ppm, many times what we have now.
The earth has been in an ice age for at least the past two million years. This cold period has drawn down much of the atmospheric CO2 concentrations and dissolved it in the oceans. When we have interglacial periods, like we're in now, the warming in the environment releases this CO2 back into the atmosphere and conditions are more favorable for growth.
This is a natural principle called "Henry's Principle" and it determines the changes in equilibrium of relative CO2 based on temperature. Man's contribution to this is like spitting in the wind.