Ancient footprints challenge the timeline of human arrival in North America, suggesting people were here much earlier than ...

It would take more than 9.5 million square miles of trees to offset the emissions of the world's 200 largest fossil fuel ...

With a waterfall twice the height of Niagara, the longest remote hiking trail in North America, and a population of just ...

A study reveals that the oldest continental crust on Earth is slowly being broken up by shifting tectonic forces.

Reaching Iran's most fortified nuclear enrichment site is a challenge, even for the world's biggest conventional weapons.

Wyoming and Montana took center stage at a congressional hearing Tuesday about fast-tracking rare earth processing in the U.S ...

Long before the Great Lakes came to define the heart of North America, a much larger lake once ruled the land. Lake Agassiz, ...

A new book traces how the American prairie was nearly destroyed and why its return is so necessary for our future.

The summer solstice, the longest day of the year in the Northern Hemisphere, falls on June 20 this year in North America, and ...

To counteract the planet-warming emissions caused by the world’s largest fossil-fuel companies, trees would have to cover the ...