The early settlement of the Americas is hugely contested area of archaeology.

More homes are burning in wildfires in nearly every Western state. The reason? Humans.

La Niña is only part of the problem. The long-term driver of increasing drought – even in areas getting more rainfall overall – is the rapidly warming climate.

Agreements negotiated a century ago to share water on Western rivers among states are showing their age in a time of water scarcity.

Keeping landscapes connected can help protect wild animals and plants. In the US Southwest, border wall construction is closing off corridors that jaguars and other at-risk species use.

Monsoons are weather patterns that bring thunderstorms and heavy rains to hot, dry areas when warm, moist ocean air moves inland. They’re challenging to forecast, especially in a changing climate.