In many Mexican cities, water is treated as a political bargaining chip – a favor that public officials can trade for votes, bribes or power.

Anyone who disregards the threats of climate change “is stupid,” says retired Lieutenant General John G. Castellaw.

The Trump administration is backing away from treaty mandate to “give preferential attention to the solution of all border sanitation problems.”

Ecotourism brings valuable funds for conservation to the islands, but it also delivers a torrent of garbage that could damage this unique ecosystem.

President Trump and Congress ignore the nation’s poorest residents along the U.S.-Mexican border, where an environmental health crisis threatens millions of lives.

An added 25-cents-per-gallon fuel tax would hurt consumers, but something different could benefit the environment.

There’s little talk of actually building a physical wall, though, and more discussion of cameras, facial recognition and other technology.

A new book offers insight into how our public lands were created — and what that means as we fight to protect them today and in the future.

A new study finds that the often-feared big cats actually help keep crops and domesticated animals safe from other threats.

This month’s new books look at America’s disappearing bees, how religion can fight climate change, a pioneering woman scientist and a lot more.