(1) acclimation of stomatal conductance to climatechange conditions results in a significant reduction of the expectedbenefits of high CO2in photosynthesis under light saturation; (2) apotential acclimation of mesophyll conductance to CO2besides gscannot be neglected when attempting to model photosynthesis in aclimate change scenario, as it roughly doubles the reduction whichoccurs with acclimation of stomatal conductance alone; (3) specieswith lower diffusional conductances have greater enhancement of