The population drop opened the door for outsiders to repopulate with new demographics and cultures.

Earth has already exceeded its ability to support the global population sustainably, with new research warning of increasing ...

A new study finds Earth has already exceeded its sustainable population limit, raising concerns about food, climate, and ...

(Mait Juriado photo/Moment/Getty Images) The human population has already grown too large and demanding for Earth to sustainably support at current consumption levels, a new study warns. Based on more ...

Human population and consumption have surpassed Earth’s limits, increasing risks to climate and global stability.

Studying human evolution involves piecing together scattered clues about how we survived against tough odds. One of the biggest mysteries is understanding how large or small ancient human populations ...

"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." Here’s what you’ll learn when you read this story: While most estimates place the current human ...

There are records of whole human groups disappearing mysteriously from parts of northwest Europe, particularly what is now ...

Across North America, mountain lions, bears and gray wolves have made a remarkable comeback over the last 50 years. Once nearly exterminated, these animals have been recovering their populations and ...