Experts at the COP29 climate conference stressed that addressing nitrous oxide (N₂O), the third most important greenhouse gas and a significant ozone-depleting agent is essential to reaching the global target of keeping warming to 1.5 degrees Celsius. If uncontrolled, Nitrous Oxide emissions can raise world temperatures by an extra 0.2°C by 2100. However, according to the United Nations Global Nitrous Oxide Assessment, putting specific mitigation measures in place could lessen this impact by 0.1°C by the end of the century.

The Growing Threat of Nitrous Oxide: Impacts on Climate, Health, and the Ozone Layer

Seventy-five percent of human-induced nitrous oxide emissions are primarily from agriculture. About 5% comes from industrial sources, while the remaining 20% comes from burning biomass, wastewater treatment, aquaculture, and the burning of fossil fuels, among other activities. Nitrous oxide has powerful effects; it traps heat 270 times better than carbon dioxide and has a long-lasting warming effect since it lasts for 120 years. Human activity has raised N₂O emissions by 20% since the industrial era, which has so far contributed to 0.1°C of global warming.

The report emphasizes that the effects on the climate and ecology will continue until there is a determined effort to reduce nitrous oxide. Nitrous oxide is uncontrolled, unlike other ozone-depleting compounds subject to the Montreal Protocol. As a result, N₂O emissions are destroying the ozone layer, protecting Earth’s life from dangerous UV rays. By the 2080s and 2090s, nitrous oxide was predicted to contribute to a 0.2–0.8% increase in cataract incidence and a 2–10% increase in skin cancer cases, particularly in regions nearer the equator.

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Routes to Mitigation and Benefits for Global Health

The United Nations report emphasizes agricultural practices and describes several methods for lowering nitrous oxide emissions. Nitrogen-loss inhibitors, improved manure management, and controlled-release fertilisers are examples of potential solutions. Changes in behavior, such as cutting back on the consumption of animal protein in some areas, are also emphasized as efficient strategies to lower N₂O emissions.

The industrial sector can also help with mitigation. The report estimates that industries might reduce N₂O emissions by implementing cost-effective abatement technology ranging from $1,600 to $6,000 per tonne of nitrous oxide. Despite accounting for only around 5% of human-generated N₂O emissions, industrial emissions are expected to rise, making this sector a prime target for abatement initiatives. Nitrous oxide is a “forgotten super pollutant,” according to Martina Otto, head of the Climate and Clean Air Coalition, who highlighted that addressing it might significantly impact public health, air quality, and the climate.

Global efforts to switch to cleaner fuels also interact with reducing nitrous oxide emissions. For instance, because it emits no carbon dioxide when burned, ammonia is becoming increasingly popular as a possible fuel for maritime transportation. Nitrous oxide, which is produced when ammonia is burned, could negate some of its supposed benefits for the climate. Similarly, the environmental benefits of biofuels from fertilized crops may be lessened if they increase N₂O emissions.

The report urges additional research to evaluate the trade-offs between nitrous oxide, methane, and carbon dioxide emissions in various industries. This research may inform strategies that balance the reduction of several pollutants, helping to provide a more comprehensive approach to climate mitigation.

Reducing nitrous oxide is critical to achieving climate goals and protecting the ozone layer. As the report emphasises, quick action is required to implement the current abatement techniques, especially in industry and agriculture. A concerted effort might dramatically reduce nitrous oxide emissions and offer health, environmental, and climate resilience benefits.

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