In parts of the Arctic, polar bears are in decline as sea ice, which they depend on to hunt, disappears. That is not the case, however, on the Norwegian island of Svalbard, where bears have actually managed to grow more plump even as ice melts away.

Solar panels on bodies of water in the northeastern U.S. might generate renewable energy but could also carry risks for birds, especially water birds.

A new analysis of air quality data from the past 70 years shows that Canada’s record wildfire smoke in 2023 is part of a broader, continent-wide trend toward smokier skies across North America.

Forensics experts gather DNA to understand who was present at a crime scene. 

PFAS, or per- or polyfluoroalkyl substances, are ubiquitous in modern life. First produced at the end of World War II, these chemicals are in everything from furniture and cosmetics to food packaging, non-stick pans and clothing.

A new study shows that interactions between wolves and cougars in Yellowstone National Park are driven by wolves stealing prey killed by cougars and that shifts in cougar diets to smaller prey help them avoid wolf encounters.

When Dr. Leluo Guan peers inside a cow’s stomach, she sees more than microbes—she sees an opportunity to cut methane emissions from cattle and improve profits for Canadian beef and dairy farmers.

Monarch butterflies have always been remarkably resilient.

It started in the summer of 2013. Sea stars were dying in huge numbers in Washington State’s Olympic National Park: They became covered in white lesions.

Flowers emit scented chemicals to attract pollinators, but this perfume — and how pollinators interact with the plant — can go through profound changes as a crop becomes domesticated.