Global nitrogen input increases greenhouse gas emissions from wetlands by affecting soil carbon and nitrogen cycling. Soil labile carbon and nitrogen play a crucial role in this process. A study of 72 research papers found that nitrogen input boosts carbon dioxide, methane, and nitrous oxide emissions from wetlands. Specifically, lower nitrogen levels and added ammonium compounds lead to increased carbon dioxide and methane emissions in freshwater wetlands, while peatlands are major nitrous oxide sources. The research also showed that nitrogen input enhances the accumulation of dissolved organic carbon, ammonium, nitrate, microbial biomass carbon, and microbial biomass nitrogen in wetland ecosystems. Dissolved organic carbon was identified as the primary driver of greenhouse gas emissions, while microbial biomass carbon has a more direct impact on emissions compared to other labile carbon and nitrogen compounds.