Over the past 200 years, the population of the United States has grown more than 40-fold to an estimated 328 million, with 81% of the population living in an urban area.

Tim Leiby had wrapped up a fun but fruitless early-morning turkey hunt and was enjoying an old John Wayne flick when I arrived at Willow Lodge near Blain, Pennsylvania. 

Volcanic eruptions and human-caused changes to the atmosphere strongly influence the rate at which the ocean absorbs carbon dioxide, says a new study. 

Air pollution has become a fact of modern life, with a majority of the global population facing chronic exposure.

hen wildfire smoke filled the skies of Oregon’s southern Willamette Valley in 2018, many residents kept their doors closed and windows shut, thinking they were safe from polluted air.

The devastating southeastern Australian bushfires that started last September spewed smoke and aerosols higher into the atmosphere than some Earth-observing instruments have ever measured.

Smoke from wildfires and agricultural burning has an important role in regulating climate.

More than 1,000 bottlenose dolphins live in the Indian River Lagoon year-round.

We have transformed the night-time environment in a very short time, relative to evolutionary timescales. 

Colorado State University Distinguished Professor Sonia Kreidenweis and her research group identified an atmospheric region unchanged by human-related activities in the first study to measure bioaerosol composition of the Southern Ocean south of 40 degrees south latitude.