Understanding the climate cost of cleaning our water
Peer-Reviewed Publication
Updates every hour. Last Updated: 9-Nov-2025 05:10 ET (9-Nov-2025 10:10 GMT/UTC)
U.S. wastewater treatment plants emit the equivalent of 47 million metric tons of CO2 each year. Methane and nitrous oxide emissions exceed previous estimates by 41%. Emissions can be slashed by tackling methane leaks, capturing nitrogen.
The winners of the 2025 Blavatnik National Awards for Young Scientists are:
Life Sciences Laureate: Philip J. Kranzusch, PhD, Dana-Farber Cancer Institute; Harvard Medical School (Microbiology) - Recognized for discovering that human innate immunity evolved from ancient pathways in bacteria, explaining the molecular basis for how human cells defend against infections and cancer.
Chemical Sciences Laureate: Frank Leibfarth, PhD, The University of North Carolina at Chapel Hill (Polymer Chemistry) - Recognized for pioneering approaches to upcycle plastic waste and remove toxic ‘forever chemicals’ from water by developing reactions and catalysts that selectively control the structure and function of polymers.
Physical Sciences & Engineering Laureate: Elaina J. Sutley, PhD, University of Kansas (Civil Engineering) - Recognized for comprehensive, systematic computer modeling and engineering to address disaster mitigation and recovery, informing building codes and disaster readiness policies across the country.
Tiny ocean organisms living in oxygen-poor waters turn nutrients into nitrous oxide—a greenhouse gas far more powerful than carbon dioxide—via complex chemical pathways.
Penn’s Xin Sun and collaborators identified the how and why behind these chemical reactions, showing that microbial competition, not just chemistry, determines how much N₂O is produced.
Their findings pave the way for more reliable climate models, making global greenhouse gas estimates more effective, predictable, and easier to understand in response to natural and man-made climate change.
Inhalers are the frontline treatment for asthma and COPD, but they come with a steep environmental cost, according to a new UCLA Health study — the largest to date quantifying inhaler-related emissions in the United States.