Human nitrogen input experienced a distinct break or stabilization in the 1990s
Evidence regarding human nitrogen inputs and agricultural emissions indicates a distinct inflection or transition point occurring during the 1990s, shifting from exponential growth to fluctuating or slower growth phases.
The retrieved papers include specific studies examining anthropogenic nitrogen input trajectories and agricultural emissions trends (such as NANI and agricultural greenhouse gas emission inventories in China) which document a clear shift, break, or transition away from unchecked rapid acceleration during the 1990s. No papers directly refute the claim.
Min Cao, Wei Gao, Yanpeng Cai. Influence of long-term anthropogenic nitrogen input and its legacy on riverine output. 2025. https://doi.org/10.1038/s41598-025-00261-6
Study on China's watershed nitrogen input notes a rapid growth phase up to the early 1990s followed by fluctuating growth starting around 1993.
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Gao Y, Li Z, Hong S, Yu L, Li S, Wei J, Chang J, Zhang Y, Zhang W, Yuan W, Wang X. Recent stabilization of agricultural non-CO<sub>2</sub> greenhouse gas emissions in China.. 2025. https://doi.org/10.1093/nsr/nwaf040
Analysis of agricultural non-CO2 emissions in China explicitly identifies a transition from rapid growth through the late 1990s to a slow growth and stabilization stage thereafter.
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