Essay on World Population in Past 50 Years.
Anthropologists believe the human species dates back at least 3 million years. For most of our history, these distant ancestors lived a precarious existence as hunters and gatherers. This way of life kept their total numbers small, probably less than 10 million. However, as agriculture was introduced, communities evolved that could support more people.
World population expanded to about 300 million by …show more content…
The growth rate of 1.2 percent between 2000 and 2005, when applied to the world's 6.5 billion population in 2005, yields an annual increase of about 78 million people. Because of the large and increasing population size, the number of people added to the global population will riain high for several decades, even as growth