In countries using the convention formerly known as the "short scale", 6 billion is 6 thousand million, or 6 thousand thousand thousand, or 6 x 10^9, 6 followed by nine zeroes. The adoption of the short scale by the United States led to its acceptance for general financial and trade usage. The short scale increases "-ion" named numbers (millions, billions) in factors of 1,000. The "long scale" used "-ion" numbers separated by a factor of a million (1,000,000) with intermediate "-iard" numbers representing thousands of those units. On the long scale, 6 billion would be 6 million million, 6 x 10^12, the same as the short scale " 6 trillion".
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The world population reached 4 billion around 1974.
The current approximate population of humans on Earth is around 7.9 billion.
World Population Growth Year Population 1 200 million 1000 275 million 1500 450 million 1650 500 million 1750 700 million 1804 1 billion 1850 1.2 billion 1900 1.6 billion 1927 2 billion 1950 2.55 billion 1955 2.8 billion 1960 3 billion 1965 3.3 billion 1970 3.7 billion 1975 4 billion 1980 4.5 billion 1985 4.85 billion 1990 5.3 billion 1995 5.7 billion 1999 6 billion 2006 6.5 billion 2009 6.8 billion 2011 7 billion 2025 8 billion 2050 9.4 billion
North America is the third most populated continent in the world, after Asia and Africa.
today there are 6 billion people living in the world