Chlorofluorocarbons, or CFCs, were once considered a triumph of modern chemistry. Stable and versatile, these chemicals were used in hundreds of products, from military systems to the ubiquitous can of hairspray.

Ecologists have long known that agricultural and sewage pollution can cause low oxygen conditions and fish kills in rivers. A study published today in Nature Communications reports that hippo waste can have a similar effect in Africa’s Mara River, which passes through the world renowned Maasai Mara National Reserve of Kenya, home to more than 4,000 hippos.

New research reveals the growth of carbon production from Chinese exports has slowed or reversed, reflecting a “new phase of globalisation” between developing countries that could undermine international efforts to reduce emissions.

Children who were exposed to higher levels of air pollution during the third trimester of their mother’s pregnancy had a higher risk of elevated blood pressure in childhood, according to new research in the American Heart Association’s journal Hypertension.

Billions of years ago, when Earth’s atmosphere reeked of unbreathable gases, microbes evolved in the absence of oxygen. As Earth matured and the nitrogen-oxygen atmosphere formed, these anaerobic, or oxygen-averse, bacteria retreated into the mud of the ocean floor and other environments where they would be safe from oxygen-rich air.

Identifying the sources of aerosol ammonium is essential because ammonium can impact the Earth’s radiative balance, as well as human health and biological diversity. The sources of ambient ammonia concentrations can be quantified based on the stable isotopic composition of ammonia for various endmembers. However, isotopic source apportionment of aerosol ammonium is challenging in the urban atmosphere, where there is excess ammonia and nitrogen isotopic fractionation commonly occurs.

Education, awareness and skill development programmes can help Pakistan reduce its carbon emissions without compromising economic growth, according to a new Pakistan-Chinese study.

The University of Alberta will lead a project to design, build and launch Ex-Alta 2, a new cube satellite to help combat forest fires, thanks to funding of $250,000 from the Canadian Space Agency.

When people are out and about, they leave plumes of chemicals behind them—from both car tailpipes and the products they put on their skin and hair. In fact, emissions of siloxane, a common ingredient in shampoos, lotions, and deodorants, are comparable in magnitude to the emissions of major components of vehicle exhaust, such as benzene, from rush-hour traffic in Boulder, Colorado, according to a new CIRES and NOAA study.

Plastic is famous for its unyielding durability, making it perfect for consumer products but a unique and persistent menace to the natural environment.

For the loggerhead sea turtles that nest on the once-pristine beaches bounding the Gulf of Mexico, millimeters-thick pieces of broken down plastic — called microplastics — pose a particularly urgent threat.