“The possibility must be considered seriously that the number of people on the Earth has reached, or will reach within half a century, the maximum number the Earth can support in modes of life that we. . . will choose to want.” —-Joel...

As a topic, population refers to the size and composition of social groupings and the dynamics of change in these characteristics. It extends to the determinants and consequences of levels, differentials, and changes in fertility, mortality, and...

Population often is said to be the biggest problem facing the world. However, precisely what this problem is varies, depending on whether the issue is meeting basic human needs, the stress placed on the natural environment by increased consumption,...

The study of populations and population ecology is a growing field of biology. Plants and animals are studied both singly and in relationship to one another. Factors that affect population growth and overall health are constantly being sought and...

Throughout most of human history, the world's population has grown gradually. It took thousands of years for the global population to reach one billion people (around 1800). Then, in a little more than a century, the population jumped to two...

According to the U.S. Census Bureau, the world's population reached 6 billion people on June 19, 1999. The Bureau operates a population "clock" that shows the population of the world changing second by second. How is this possible?...

A population is a geographically distinct group of individuals of the same species that is co-occurring in time and space, and can potentially interbreed with each other. Populations are an important element of evolutionary biology, and in the ecology...

In sociology and biology a population is the collection of people or individuals of a particular species. A population shares a particular characteristic of interest most often that of living in a given geographic area. In taxonomy is population a...