The concentration of carbon dioxide in the atmosphere hit 415.39 parts per million (ppm) over the weekend — the highest level seen in some 3 million years, before humans existed, according to scientists at the Mauna Loa Observatory in Hawaii.

A University of Oklahoma-led interdisciplinary global study expands the understanding of activated sludge microbiomes for next-generation wastewater treatment and reuse systems enhanced by microbiome engineering.

The deepest layers of carbon-14 dated ice found in the Col du Dôme of the Mont Blanc glacier in the French Alps provide a record of atmospheric conditions in the ancient Roman era.

In the February 11 issue of Nature Sustainability, a multi-institution team unveiled a new tool for understanding and controlling the health and climate impacts of shipping goods – a source not only of greenhouse gases but of soot and smog threatening our health.

The processes that create ozone pollution in the summer can also trigger the formation of wintertime air pollution, according to a new study from researchers at the University of Colorado Boulder and NOAA, in partnership with the University of Utah.

The combination of a big population, good genes and luck helps explain how a species of fish in Texas’ Houston Ship Channel was able to adapt to what normally would be lethal levels of toxins for most other species, according to a study to be published May 3 in the journal Science.

Medications excreted in the urine or dumped into the toilet can end up in the water supply, just like lotions or cosmetics that wash off the body and go down the sink or shower drain. 

Colorado nail salon employees face increased health risks due to high levels of indoor airborne pollutants such as formaldehyde and benzene, new CU Boulder research finds, concluding that working in a salon is akin to working at an oil refinery or an auto garage.

Volunteers have removed more than 3 tons of trash from Mount Everest in just two weeks, part of an ambitious project by the Nepalese government to clean up decades of garbage left by hikers and tourists that has recently been exposed by melting snow and ice, Agence France-Presse reported.

Hydrogen is a critical component in the manufacture of thousands of common products from plastic to fertilizers, but producing pure hydrogen is expensive and energy intensive.