The document discusses global population trends from 2009-2050. It notes that the world population in 2009 was 6.8 billion and is projected to reach 8.1 billion by 2025. Many developed countries have total fertility rates around 1.7 children per woman compared to 4.6 in the least developed countries. By 2050, the population of Africa is projected to double to almost 2 billion. The document also lists the most populous countries in 2009 and projections for 2050, and countries with the highest CO2 emissions in 2006.