Is it possible that higher atmospheric CO2 concentrations increases available food.?

Theories abound that state the increased CO2 concentrations over the last century cause global warming, which in turn cause greater flooding, droughts and displacements of peoples. Floods and droughts can cause food shortages---no arguing that, but could it not be the reality that increased CO2 concentrations increase food stocks for the world, therein offsetting the alleged disruption of food supplies, caused by higher CO2 levels. Is it possible that higher CO2 concentrations in the biosphere is actually a GOOD thing? A net positive??