https://phys.org/news/2026-02-global-breakdown-major-greenhouse-gas.html
by Brian Bell, University of California, Irvine
Excerpt: Scientists at the University of California, Irvine have discovered that climate change is causing nitrous oxide, a potent greenhouse gas and ozone-depleting substance, to break down in the atmosphere more quickly than previously thought, introducing significant uncertainty into climate projections for the rest of the 21st century.
The UC Irvine scientists shared their findings in a paper published today in Proceedings of the National Academy of Sciences.
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“The change in the life cycle of atmospheric nitrous oxide is a critical piece of the puzzle that has been largely overlooked,” said co-author Michael Prather, UC Irvine professor of Earth system science. “While most research has focused on projecting changing N2O emissions from human activities, we’ve shown that climate change itself is altering how quickly this gas is destroyed in the stratosphere—and this effect cannot be ignored in future climate assessments.”
According to climate scientists, nitrous oxide is the third-most-important long-lived greenhouse gas after carbon dioxide and methane, and it’s currently the dominant ozone-depleting substance produced by human activities. With atmospheric concentrations reaching approximately 337 parts per billion in 2024 and increasing at about 3% per decade, understanding N2O’s behavior is critical for both climate change mitigation and stratospheric ozone protection efforts, according to Prather.
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This shift, which is due to climate change-driven alterations in stratospheric circulation and temperature, is comparable in magnitude to differences across the various emissions scenarios currently used by the Intergovernmental Panel on Climate Change for climate assessments.
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For example, the scientists found that a continuation of the observed lifetime decrease trend would reduce projected N2O levels by an amount equivalent to shifting from a high-emissions scenario (SSP3-7.0) to a moderate-emissions scenario (SSP1-2.6 or SSP2-4.5)—without any change in actual emissions.
