text: Gutierrez et al .'s findings are perhaps best summed up by the title of their paper: "Acclimation to future atmospheric CO 2 levels increases photochemical efficiency and mitigates photochemistry inhibition by warm temperatures in wheat." They report, for example, that net photosynthesis was increased by 62-72% in both years in the CO 2 -enriched chambers; while at the conclusion of the growing season, total plant biomass production in the CO 2 -enriched chambers was increased by 12-18%. What it means