AP BIOLOGY

Detailed explanation-1: -With industrialization, improvements in medical knowledge and public health, together with a more regular food supply, bring about a drastic reduction in the death rate but no corresponding decline in the birth rate. The result is a population explosion, as experienced in 19th-century Europe.

Detailed explanation-2: -We’ve added over 6 billion people to the human population in just a little over 200 years (figure 12.1. a). As of August 2020, the global human population is around 7.8 billion people. Although global population size continues to increase, the rate of human population growth has decreased.

Detailed explanation-3: -From this 10, 000-foot view, it’s clear that human population growth started going exponential around the time of the Second Agricultural Revolution, which started in the 17th century in Britain.

Detailed explanation-4: -With the Industrial Revolution gathering steam, the global population growth rate jumped from around 0.02% per year in the early 1400s to 0.23% in 1600 and then 0.33% in the mid-1700s. By 1970, it peaked at about 2% per year, and began its return to the norm.