Answer :
The world was in the first stage of the demographic transition. Once health improved and mortality declined things changed quickly. Particularly over the course of the 20th century: Over the last 100 years global population more than quadrupled.
Due to medical advancements, decreased mortality rates, and a rise in agricultural output made possible by the Green Revolution, the population has increased dramatically over the past 100 years—by a factor of four. Since long-term exponential expansion involves the potential threats of starvation, illness, and widespread mortality, some are concerned that the earth's ecology cannot support the rapid development of the human population.In addition, the Industrial Revolution caused a demographic surge that was unheard of. The population quadrupled in the 19th century, tripled in the 20th century, and reached 6 billion in the year 2000. This exponential increase was caused by breakthroughs in medicine, science, and the economy.
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