An examination of Rocky Mountain snow finds higher contamination levels of mercury and others metals in the northern part of the range, consistent with increased current and historical mining in the region.

Footprints Claimed as Evidence of Ice Age Humans in North America Need Better Dating, New Research Shows

Early Human Activities Impacted Earth’s Atmosphere More Than Previously Known

Over the last several decades, extreme heat events around the world—particularly in the North American Southwest—have gotten hotter, occurred more frequently, and lasted longer