I must admit to being unaware that population growth had leveled off..

Make sure you read that closely:

In the 1990s, the U.N. started taking a closer look at fertility patterns, and in 2002, it adopted a new theory that shocked many demographers: human population is leveling off rapidly, even precipitously, in developed countries, with the rest of the world soon to follow.

The site to visit is the United Nations Population Division Home Page. Africa is at 4.8, Asia is at 2.5, Latin America is at 2.8, and Oceania is at 2.4. Only Europe and North America are at or below replacement rate, at 1.5 and 2.1, respectively.

Of course, the fertility rate is not the same as the replacment rate, so a proper mapping requires additional data.

RE: Environmental Heresies