Note: This is the 1997 edition of UNEP's Global Environment Outlook. If you are interested in more recent information, please see the 2000 and 2002 editions.

Figure 4.3. Recent and projected trends in population growth.

Alcamo et al. (1994); Berry (1990); UN (1992); WRI/UNEP/UNDP (1986, 1992, 1994); Klein Goldewijk and Battjes (1995).
One billion represents 109 or one thousand million.