Table 4. Agricultural water quality (AWQ) impact of climate-driven agricultural frontiers under RCP 8.5 and RCP 4.5.
Elevated AWQ is >50% of water supply with AWQ impacts.
| AWQ footprint (million km2) | Elevated AWQ1 footprint (million km2) | Current population affected by AWQ (billion) | Current population affected by elevated AWQ1 (billion) | Potential population affected by AWQ (billion) | Potential population affected by elevated AWQ (billion) | Footprint per land area of cropland | Global dam estate affected by AWQ (%) | Global dam estate affected by elevated AWQ1 (%) | |
|---|---|---|---|---|---|---|---|---|---|
| Frontiers RCP 8.5 2060–2080 Median | 11.7 | 5.2 | 0.7 | 0.1 | 1.4 | 1.1 | 0.79 | 7.3 | 2.9 |
| Frontiers RCP 8.5 2060–2080 Max | 15.6 | 7.8 | 0.8 | 0.2 | 1.8 | 1.6 | 0.87 | 8 | 3.8 |
| Frontiers RCP 8.5 2060–2080 Min | 9.1 | 3.9 | 0.7 | 0.1 | 1.2 | 0.9 | 0.67 | 6.4 | 2 |
| Frontiers RCP 4.5 2060–2080 Median | 6.6 | 2.2 | 0.5 | 0.07 | 0.7 | 0.662 | 0.82 | 6.3 | 2.4 |
| Frontiers RCP 4.5 2060–2080 Max | 8.9 | 3.6 | 0.52 | 0.1 | 1.017 | 1.017 | 0.95 | 6.9 | 3.1 |
| Frontiers RCP 4.5 2060–2080 Min | 4.7 | 1.2 | 0.4 | 0.05 | 0.407 | 0.407 | 0.65 | 5.5 | 1.7 |
| Global (reference period 1960–90) | 53.2 | 37.6 | 7.5 | 4.1 | 9.4 | 7.5 | 0.71 | 63.3 | 50.2 |