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 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.

As the world population reaches seven billion people, the BBC's Mike Gallagher asks whether efforts to control population have been, as some critics claim, a form of authoritarian control over the ...

Note (June 2025): Religious composition estimates in this report are based on 2010 baseline numbers that have since been updated. Please refer to our 2025 report “How the Global Religious Landscape ...

The authors do not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and have disclosed no relevant affiliations beyond their ...

Genetic variation describes naturally occurring genetic differences among individuals of the same species. This variation permits flexibility and survival of a population in the face of changing ...

Canada’s population fell by roughly 76,000 over the third quarter, the largest decline this country has seen in records ...

Australian and Asian birds are a clear example of population collapse. In the time that records have been kept of bird populations, 20 percent of all species have gone extinct. More are likely to ...

High-quality primary care is a critical tool to advance health equity within Medicaid, which includes many enrollees who identify as people of color. This population experiences long-standing health ...

Discover how simple random sampling ensures accurate and unbiased population research, offering efficiency and fairness over ...