Population ecology is the study of how populations — of plants, animals, and other organisms — change over time and space and interact with their environment. Populations are groups of ...

The senior population in the U.S. has grown as the baby-boom generation has progressed into the 65 years and older age group. In 2023, there were 59,307,056 Americans over the age of 65.

The human population has experienced a period of unprecedented growth, more than tripling in size since 1950. It reached almost 7.8 billion in 2020 and is projected to grow to over 8.5 billion in ...

Last week, the UN Department of Economic and Social Affairs released the World Population Prospects, the international body’s annual report on the current and future state of global population.