On this page I will compile any interesting statistics.

Population growth up to 2050:

According to the 2006 Revision, the world population will likely increase by 2.5 billion over the next 43 years, passing from the current 6.7 billion to 9.2 billion in 2050. This increase is equivalent to the overall number of people in the world in 1950 and it will be absorbed mostly by the less developed regions, whose population is projected to rise from 5.4 billion in 2007 to 7.9 billion in 2050. In contrast, the population of the more developed regions is expected to remainlargely unchanged at 1.2 billion and would have declined were it not for the projected net migration from developing to developed countries, which is expected to average 2.3 million persons a year after 2010.

Source: World Population Prospects -The 2006 Revision, United Nations, Department of Economic and Social Affairs,
Population Division