Question

At the beginning of 21 century the world population was​

Answer 1

around 6.2 billion. i hope this helps you out some! :)

Answer 2

Answer:

The world population was about 6.1 billion at the start of the 21st century, and reached 7.7 billion by January 2019. It is estimated to reach about 8.6 billion by the year 2030, and 9.8 billion by the year 2050.