The ideal number of humans on Earth is around 2.5 billion and a major study explains what that means for our future.

Researchers formulated a mathematical equation that unifies 12,000 years of human population growth and points to an alarming ...

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 ...

Coastal populations are expanding quickly around the world. The rise is evident in burgeoning waterfront cities and in the increasing damage from powerful storms and rising sea levels. Yet, reliable, ...

The Earth has already exceeded its ability to support the global population sustainably, with new research warning of increasing pressure on food security, climate stability, and human wellbeing.