Fig. 4: Water gaps in major hydrological basins of the world.

a Water gaps for the baseline period (2001–2010), and b, c variations in water gaps in a 1.5 °C and 3 °C warmer climate. The maps show the multi-model average among the five climate models considered in this study. Agreement among climate models regarding trends in water gap variations in a 1.5 °C (d) and 3 °C (e) warmer climate. Exacerbation of water gaps is shown in yellow, no change in green, and a decrease in water gaps in blue. Gray basins indicate a lack of agreement among climate models. The outline of the major hydrological basins of the world is based on data from the Food and Agriculture Organization of the United Nations75.