Question

How long did it take the human race to double its population from 1 billion to 2 billion?

Answer 1

Unit 5: Human Population Dynamics // Section 4: World Population Growth Through History

World population reached: Year Time to add 1 billion

2 billion 1927 123 years

3 billion 1960 33 years

4 billion 1974 14 years

5 billion 1987

Answer 2

Answer:

World population milestones went unnoticed until the 20th century, since there was no reliable data on global population dynamics. It is estimated that the population of the world reached one billion for the first .