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A global analysis suggests that farming can reduce air pollution and greenhouse-gas emissions by coordinating the many stages of the soil nitrogen cycle. Researchers examined 2,235 comparisons from 210 experimental sites. Replacing synthetic fertiliser with organic materials such as manure, crop residues and biochar lowered nitrous oxide emissions by an average of 21.8 percent and ammonia emissions by 40.6 percent. However, the main explanatory factor was not whether any single soil process became faster or slower. It was “synchrony”: how closely mineralisation, microbial uptake, nitrification and denitrification worked together. When these stages fall out of step, intermediate nitrogen compounds accumulate and escape into the atmosphere. The authors therefore compare the cycle to a production line in which a bottleneck creates waste. Their modelling indicates that better coordination could deliver particularly large gains in European croplands for nitrous oxide and African croplands for ammonia. The findings favour locally tailored management over simply replacing one fertiliser category with another.