Fig. 1.

Midlatitude and low-latitude changes in atmosphere-centric (reds) and plant-centric (blues) metrics and variables, and the attribution of variables to the physiological or radiative effects of CO₂. (A) Fraction of the response in the FULL experiment attributable to the CO₂rad (white) and CO₂phys experiments (gray). The difference in the annual mean for latitudes between 45°S and 45°N over a quadrupling of CO₂ is shown for each of three experiments for seven climate models from the CMIP5 archive and the multimodel mean for (B) P-E over land (millimeters per day) where larger values indicate more water availability on land, (C) PET (millimeters per day) where larger values indicate more water loss from the land, (D) P over land (millimeters per day), (E) PDSI where larger negative values indicate more severe drought, and (F) E (millimeters per day) where positive values indicate a larger flux from the land to the atmosphere.