A Colorado State University experiment spanning more than two decades has found that removal of apex predators from an ecosystem can create lasting changes that are not reversed after they return—at ...

Antibiotics that escape into the environment are widely recognized as a growing threat to ecosystems, wastewater treatment performance, and the spread of antimicrobial resistance. A new study shows ...

WELDON, Calif. — California is recognized as one of the world’s hotspots of biodiversity, with more species of plants and animals than any other state. And a significant number of the state’s species, ...

Drought, human-caused climate change, invasive species and a “legacy” of environmental issues are permanently altering California’s landscape and placing some communities and ecosystems at increasing ...