Demography: The Study Of - Human Population

: Death rates fall due to better sanitation and medicine, while birth rates remain high, leading to rapid population growth.

: The movement of people across borders. While net migration is zero at a global level, it is a critical driver of "fast demography" at the national level, often offsetting natural population declines in developed countries. The Demographic Transition Model (DTM) Demography: The Study of Human Population

: The incidence of death in a population. Improvements in healthcare and nutrition have led to a significant increase in global life expectancy, which rose by over eight years between 1995 and 2026. : Death rates fall due to better sanitation

The structure and evolution of any population are determined by three fundamental variables: while birth rates remain high