Global nitrous oxide emissions have risen by 40 percent since 1980
In short: Researchers tracking the global nitrogen cycle found that annual human-caused nitrous oxide emissions increased by 40 percent between 1980 and 2020. While this potent greenhouse gas accounts for about 6.4% of total radiative forcing since the preindustrial era, its atmospheric concentration is now rising at its fastest rate in decades.
The study combined 'bottom-up' data—such as inventories and land/ocean models—with 'top-down' atmospheric measurements to map sources across 21 categories. The results show that agriculture remains the primary driver of these emissions, though China has overtaken Europe as the leading emitter since the 2010s.
A significant limitation is the inherent uncertainty in bottom-up modeling, which produced a wider range of estimates compared to more precise atmospheric inversions.
Why it matters: Understanding the shift in global nitrous oxide emissions is critical for meeting international climate goals and managing nitrogen cycles.
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Sources
- Source: Research: Tian et al. (2024). Global nitrous oxide budget (1980–2020). Earth system science data. · cc-by
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