Adequate levels of light, water and nutrients are needed for good plant growth.  Hence, it might logically be assumed that the growth-promoting effects of atmospheric CO2 enrichment would be reduced when these essential resources are present in less-than-adequate amounts.  As shown in the sections below, however, hundreds of experiments have clearly demonstrated that such need not be the case. 

In many instances, in fact, the percentage growth enhancement provided by atmospheric CO2 enrichment is even greater when these important natural resources are present in sub-optimal quantities; and when they are in such short supply that plants cannot survive under current atmospheric CO2 concentrations, elevated levels of CO2 often enable such vegetation to grow and successfully reproduce where they would otherwise die.