The world population has grown tremendously over the past two thousand years. In 1999, the world population passed the six billion mark. This growth is due to the agricultural and industrial revolutions that decreased childhood mortality rates and increased life expectancies.
Current projections show a steady decline in the population growth rate, with the population expected to peak at around 9 billion between the year 2040 and 2050. The growth rate peaked at 2.2% in 1963 and annual births peaked at 163 million in the late 1990s.
Current estimates by the United States Census Bureau put the global population at 6,854,901,988. The CIA Factbook estimates that as of 2009, 220,980 people where being born every day.
The rapid increase in human population over the course of the 20th century has raised concerns about overpopulation. The scientific consensus is that the current population expansion and accompanying increase in usage of resources are linked to threats to the ecosystem, including rising levels of atmospheric carbon dioxide, global warming, and pollution.
Asia accounts for over 60% of the world population with almost 3.8 billion people. China and India together have about 40 percent of the world’s population. Africa follows with 840 million people, 12% of the world’s population. Europe’s 710 million people make up 11% of the world’s population. North America is home to 514 million (8%), South America to 371 million (5.3%), and Australia to 21 million (0.3%).
The list below shows past world population data back to the year one and future world population projections through the year 2050.
World Population Growth
Year 1: Population 200 million
Year 1000: Population 275 million
Year 1500: Population 450 million
Year 1650: Population 500 million
Year 1750: Population 700 million
Year 1804: Population 1 billion
Year 1850: Population 1.2 billion
Year 1900: Population 1.6 billion
Year 1927: Population 2 billion
Year 1950: Population 2.55 billion
Year 1955: Population 2.8 billion
Year 1960: Population 3 billion
Year 1965: Population 3.3 billion
Year 1970: Population Year 3.7 billion
Year 1975: Population 4 billion
Year 1980: Population 4.5 billion
Year 1985: Population 4.85 billion
Year 1990: Population 5.3 billion
Year 1995: Population 5.7 billion
Year 1999: Population 6 billion
Year 2006: Population 6.5 billion
Year 2009: Population 6.8 billion
Year 2011: Population 7 billion
Year 2025: Population 8 billion
Year 2050: Population 9.4 billion
Overpopulation and Sustainable Development
World Population Day 2010: Everyone Counts
Global Trends 2025: A Greener World
350.org Makes History With its International Day of Climate Change Action