Figure 4.23. Availability of fresh water, assuming conventional development: number of people by availability of fresh water.

RIVM/UNEP (1997); Klepper et al. (forthcoming).
In 1990, 0.3 billion people lived in extremely low population-density areas that are not included in this study. In 2015, this figure is projected to increase to 0.5 billion; in 2050, to 0.7 billion.