Question

how many members
are there
in world
population
and
why??​

Answer 1

Answer:

In demographics, the world population is the total number of humans currently living, and was estimated to have reached 7,800,000,000 people as of March 2020. It took over 2 million years of human prehistory and history for the world's population to reach 1 billion, and only 200 years more to reach 7 billion.

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Answer 2

In demographics, the world population is the total number of humans currently living, and was estimated to have reached 7,800,000,000 people as of March 2020.[2][3] It took over 2 million years of human prehistory and history for the world's population to reach 1 billion,[4] and only 200 years more to reach 7 billion.[5]The world population has experienced continuous growth following the Great Famine of 1315–1317 and the end of the Black Death in 1350, when it was near 370 million.[6] The highest global population growth rates, with increases of over 1.8% per year, occurred between 1955 and 1975 – peaking at 2.1% between 1965 and 1970.[7] The growth rate declined to 1.2% between 2010 and 2015 and is projected to decline further in the course of the 21st century.[7]

The global population is still increasing, but there is significant uncertainty about its long-term trajectory due to changing rates of fertility and mortality.[8] The UN Department of Economics and Social Affairs projects between 9-10 billion people by 2050, and gives an 80% confidence interval of 10-12 billion by the end of the 21st century.[9]