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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.

This fact sheet is based on Pew Research Center tabulations of microdata from the Census Bureau’s 2023 American Community Survey (ACS), provided through IPUMS from the University of Minnesota. All ...

After more than 50 years of rapid growth, the nation’s immigrant population is now in decline. In January 2025, 53.3 million immigrants lived in the United States – the largest number ever recorded.

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 ...

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 ...

According to Elon Musk, the world’s richest man and the father of at least a dozen children, the greatest potential risk to the future of civilisation is population collapse. Taking a very long-term ...

Immigration crackdowns may be slowing U.S. population growth and reshaping the economy, says Luke Pardue, policy director at the Aspen Institute Economic Strategy Group. The Trump administration's ...