The West is filled with land that helps to preserve vital wildlife habitats, according to conservation groups and ecologists.

The geographies of upward mobility show U.S. regions that emphasize investments in the common good over economic libertarianism do better ...

The five newest National Recreation Trails in six states add nearly 400 miles to the network of more than 1,300 trails.

It’s the Fourth of July — when fine particulates fill the air. The impact fireworks can have on air quality can be quite striking and seemingly outsized given their relatively small explosive force.