A summary of 270 laboratory studies (Idso, 2013) of 83 food crops showed that increasing CO2 concentrations by 300 ppm will increase plant growth by an average of 46% across all crops studied. Conversely, a large number of studies show the adverse effects of a low-CO2 environment. For instance, Overdieck (1988) indicated that, compared to today, plant growth was reduced … Continue reading More CO2 means more plant growth.