http://www.digitaljournal.com/article/313510

Earth supporting over 7 billion people

Posted Oct 28, 2011 by KJ Mullins
The world population has passed the seven billion mark. In just 12 years the global population increased from six billion to seven billion.
African urban centers are home to some 400 million people  with 60 percent of that number living in ...
African urban centers are home to some 400 million people, with 60 percent of that number living in slum conditions. Kibera Slum dwellers shown here are relocating to their new home after completion of a housing project.
Photo © UN-HABITAT
Much of the world's population growth has taken place in the poorest countries. In the past three decades the Sub-Saharan African population has doubled said Wendy Baldwin, president and CEO of the Population Reference Bureau (PRB). Today the area has 883 million people.
In developing countries the annual population growth rate is four times higher than for developed countries. In 1980 the world growth rate was 1.8 percent compared to 1.2 percent in 2011.
Across the globe total fertility rates vary widely. In 1980 the TFR was 3.7. In just 3 decades that figure has declined to 2.5.
Most of the significant population growth appears to be taking place in developing nations while the developed countries has stalled. In developed nations the TFR is roughly two children or less per woman. It is thought that this rate will begin to take place in more developing countries, with Cuba and Chile already seeing the 2 child rate per women. The rate in Afghanistan and Nigeria is at a high level with five or more children per woman.
The United Nations projections that the world will be at 8 billion by 2025, although it is possible that benchmark could arrive sooner.
The actual rate of babies being born has slowed but we are living longer. Smaller families and longer lives have lead to a global scale of a larger population. Simply put, we're not dying fast enough.