New findings expand the range of livable regions in interior South Africa nearly 200,000 years ago, during an ice age called MIS6.

The tiny organisms that cause harmful blooms of algae can have a big impact on your trip to the shore. A toxicologist explains what causes these events and how to keep people and pets safe.

Reservoirs and streams are in good shape in California and the Great Basin, but groundwater and ecosystems are another story. And then there’s the Colorado River Basin.

The idea that human activity threatens nature, and that it is important to protect wild places, dates back to the dawn of the Industrial Revolution.

The number of lakes on Earth has increased substantially in recent decades—particularly small lakes, which emit a lot of greenhouse gases.

Western New York got socked by a storm that dumped 6 feet of snow in parts of the region, including the home of the Buffalo Bills’ stadium. A climate scientists explains how storms like this happen.

A climate scientist explains the forces behind the summer’s extreme downpours and dangerous heat waves, and why new locations will be at risk in the coming year.

Arctic lakes are drying up. A new study offers clues as to why—and what can be done to slow the loss.

Windermere has seen extensive algal blooms, attracting attention over its ecological consequences. But this is nothing new.