density of oxygen required in an area of population 10000
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The world population increased from 1 billion in 1800 to 7.7 billion today.
The world population growth rate declined from 2.2% per year 50 years ago to 1.05% per year.The cartogram is made up of squares, each of which represents half a million people of a country’s population. The 11.5 million Belgians are represented by 23 squares; the 49.5 million Colombians are represented by 99 squares; the 1.415 billion people in China are represented by 2830 squares; and the entire world population of 7.633 billion people in 2018 is represented by the total sum of 15,266 squares.
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