Table 1.
Projected populations affected in all 406 coastal counties exposed across four spatio-temporal zones between 2000 and 2100 under Shared Socioeconomic Pathway 2 (SSP) and Representative Concentration Pathway 4.5 (RCP) in millions.
| Specified level of SLR | Coastal Floodplains | ||||
|---|---|---|---|---|---|
| Year | High-Tide Line | EAE | 100-year Flood Plain | LECZ | Total |
| 2000 | 0.15 | 0.61 | 2.39 | 29.00 | 107.15 |
| 2020 | 0.23 (0.2–0.27) | 0.97 | 3.41 (3.11–3.81) | 39.89 (38.92–40.89) | 133.61 (130.84–136.47) |
| 2050 | 0.46 (0.28–0.82) | 1.78 | 5.32 (3.75–7.58) | 52.32 (43.24–62.3) | 165.95 (138.18–195.85) |
| 2070 | 0.74 (0.31–1.78) | 2.63 | 6.94 (3.84–11.88) | 58.79 (42–78.95) | 181.9 (131.42–240.91) |
| 2100 | 1.23 (0.31–5.09) | 4.13 | 8.95 (3.42–22.26) | 63.36 (35.59–100.07) | 190.07 (108.8–293.77) |
Uncertainty intervals in parentheses relate to SSP3, 5th percentile and SSP5, 95th percentile. Total refers to the total population in all 406 coastal counties. Note that each spatial zone and related class are cumulative, not mutually exclusive. For example, the Low-Elevation Coastal Zone (LECZ) estimate encompasses all other spatial zones.