Table 4

Continental and global summaries for population, irrigable land, sustainable water supply defined as discharge (Q), and relative all-sector water demand (DIA/Q) tabulated for the contemporary condition and simulated by CGCM1/WBM. Percentages assigned to the change in DIA/Q (ΔDIA/Q) are relative to the 1985 contemporary baseline.

AreaPopulation (millions)Irrigated cropland (1000 km2)Observed Q (km3year−1)Contemporary DIA/Q(unitless)2025 Q (km3year−1)Predicted ΔDIA/Q(%)
19852025Sc1Sc2Sc3
Africa54314401184,5200.0324,100107392
Asia29304800169013,7000.12913,3002.36066
Australia/Oceania2233267140.0256922.03044
Europe6676822732,7700.1542,790−1.93031
North America3956013175,8900.1055,870−4.42328
South America2674549511,7000.00910,4001293121
Globe48308010252039,3000.07837,1004.15061