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 ...

The United States is growing older. The median age in this country is rising, according to the Census Bureau. The median is now almost 39 years old, meaning that half the population is below that age ...

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.

John Wilmoth is Director, Population Division of the United Nations Department of Economic and Social Affairs (UN DESA). Clare Menozzi, Lina Bassarsky and Danan Gu are Population Officers, UN DESA.

A primary risk, as a population ages, is under-investment in children. As children make up an increasing share of the ...

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.

Vermont Fish & Wildlife staff measure a black bear as part of a newly launched survey this summer. Photo courtesy of Vermont Fish & Wildlife Department. For the fourth year in a row, the number of ...