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.

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 ...

We're in the midst of the Earth’s sixth mass extinction crisis. Harvard biologist E. O. Wilson estimated that 30,000 species per year (or three species per hour) are being driven to extinction.