Introduction
Section outline
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World population is the number of humans living on Earth. This unit describes how the world's population has grown over the centuries, where people live , the problems that countries have and the dangers of overpopulation.
Today, more than 8 billion people live on our Earth. Each year, the world’s population grows by about 80 million. If it continues to grow at such a rate the world’s population will reach 9 billion by the year 2035.
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Words
- billion = a thousand million = 1,000,000,000
- century = a hundred years
- overpopulation = too many people living in a place