The Green River defies gravity: it flows through 99 miles of mountains thanks to movements hidden beneath the surface.

For decades, scientists have generally thought that rivers emit more carbon dioxide, a greenhouse gas, than they take in. But a new analysis of every river network in the contiguous United ...

The United States has quite a formidable landmass, with thousands of square miles stretched between two oceans, mountains, deserts, great plains, and everything in between. With such a large area, the ...