The world population is one of the keys to quantify environmental space, as the concept is population dependent.
In 1992, the world population was 5.5 billion and it reached 6 billion in 1999. In 2005, the world population was 6.477 billion people. The population increased by half a billion in just half a decade. By 2025, the world population will reach an estimated number of 7.952 billion people. By 2050, the estimated figure is 9.262 billion. That means that in the next 45 years, the world population will increase by 43%. This will lead to an increased demand for food, physical space, and other resources.
The world population is unevenly distributed. Asia is the most crowded continent, both in terms of absolute population and population density. It accomodates more than half of the world population on less than one-fifth of the world land area. Sub-Saharan Africa has the youngest population with nearly half of the people under 15. It is noteworthy to mention that around 80% of the world population lives in the less-developed countries, where only 20% of the world wealth is located.
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