Mystery untreated sewage appears in Mexico just across the border from an Arizona wastewater-treatment plant, city official says.

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.

Learning how to communicate the issues in a way that people can understand and feel is the key to positive change.

America’s waters are contaminated by poop and bacteria. Use our maps to find the worst waste locations near you.

Drift of the pesticide dicamba has been linked to crop damage in 25 states this year.

Here are five ways to help to make the world a more diverse — and more just — place.

An atrocity of mercury poisoning began in the 1930s. Does a new treaty go far enough?

Rescuers turn out for Houston’s famous Waugh Bridge bat colony.

A new study reveals that air pollution from industrial sources increases levels of five different stress hormones.

A new report finds that malnutrition, unsafe water, drought, floods and other environmental dangers affect hundreds of millions of people worldwide.