Fig. 2.
Changes in surface air temperature, runoff, and near-surface relative humidity in response to CO2-radiative forcing, CO2-physiological forcing, and combined CO2-radiative and physiological forcing. They are averaged annual mean changes in response to a doubling of atmospheric CO2 calculated from the last 70-yr results of 100-yr simulations. Hatched areas are regions where changes are not statistically significant at the 5% level using the Student t-test. Isolines for temperature changes of 3K (white solid lines) and 4K (white dashed lines) are plotted for the case of CO2-radiative and combined CO2-radiative and physiological forcing to highlight the differences between these two.