A research team predicts that the Earth’s population will stabilize by 2050. The world population in 2100 will be within a range of 15.8 billion people (according to the highest estimates with a high fertility variant) and 6.2 billion (according to the lowest estimates with a low fertility variant). The lowest estimate is actually lower than the current world population of 7 billion. In fact, the world-wide fertility rate has already fallen by more than 40% since 1950.
United Nations, February 2013