In recent decades, the world population explosion becomes a global problem. Population explosion can be considered as a long-term perspective. It is defined as the growth of high population in a short period makes the living space , food, water and natural system be threatened. Why is the population boom important? How does it effect on the social living? .
People need to have a right awareness and concern for population explosion. The world population is growing rapidly with approximately 80 million people each year. The number of population is expected to keep growing slowly in the 21st century. In the article "The Population Threat" by Michael S. Teitelbaum, a demographer and the former Vice President of the Alfred P. Sloan Foundation in New York City, there were only 150 million people in the Stone Age. After more than one thousand years of formation and development, the world population reached 1 billion people in 1850. In 1950, 100 years later, the world population reached 2.5 billion people. The global population has risen annually. In 1985, the world population amounted to 5 billion, a doubling that occurred over 35 years. It was an enormous growth. .
Overall, the period of industrial revolution from 1965 to 1970, the population growth rate reached the highest ever recorded, above 1.8% per year. In the following years, the growth rate of world population tended to slow down. The cause of the rapid growth of population in the early stages of history was due to the demand of the workforce for the social development. However, the death rate in that period was high because of the lack of knowledge of technology and many dangerous diseases. In the 1970s, the birth rate still maintained at a high level, but mortality rate tended to decrease because the technological revolution in the 18th century had improved the quality of life significantly. In addition, in the 18th century, vaccines, antibiotics and map of human genome were invented to help eliminate many serious diseases of the last century.