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 organisms of ...

Earth's population reached a new record in November 2022 when it became home to 8 billion people. The United Nations has predicted that by 2037, Earth's population will have reached 9 billion people.

The global human population has been climbing for the past two centuries. But what is normal for all of us alive today — growing up while the world is growing rapidly — may be a blip in human history.

Learn more about why the human population seems to be in decline and what that could mean for the future. In the U.S., a baby is born every 9 seconds. A person dies every 9 seconds. An international ...

Population ageing, a global phenomenon characterised by a significant increase in the proportion of older people within a population, stands as a testament to humanity’s progress and challenges. As ...