EVERYDAY SCIENCE

Detailed explanation-1: -The world population has grown rapidly, particularly over the past century: in 1900, there were fewer than 2 billion people on the planet. The world population is around 8.05 billion persons in 2023. Two metrics determine the change in the world population: the number of babies born and the number of people dying.

Detailed explanation-2: -Human population has grown exponentially over the past century. It has done so largely by producing large amounts of food, and learning how to control disease.

Detailed explanation-3: -The world’s human population is growing at an exponential rate. Humans have increased the world’s carrying capacity through migration, agriculture, medical advances, and communication. The age structure of a population allows us to predict population growth.

Detailed explanation-4: -The world’s population is more than three times larger than it was in the mid-twentieth century. The global human population reached 8.0 billion in mid-November 2022 from an estimated 2.5 billion people in 1950, adding 1 billion people since 2010 and 2 billion since 1998.

Detailed explanation-5: -This rapid growth increase was mainly caused by a decreasing death rate (more rapidly than birth rate), and particularly an increase in average human age. By 2000 the population counted 6 billion heads, however, population growth (doubling time) started to decline after 1965 because of decreasing birth rates.