Solomon Islands' Sources of N2O Emissions
Key Insights
Agriculture Dominates, Then Eases
For the Solomon Islands, agriculture has contributed the majority of N2O emissions-around three-fifths of the total. Emissions were minimal through the early 20th century, then rose through the post‑war era, reaching their highest levels around the late 1970s. Since then, agricultural emissions have edged down and settled into a narrow range, hovering around 0.02 to 0.015 megatonnes, indicating a long period of relative stability with a gentle decline in climate impact.
Slow Rise In Other Sectors
Beyond agriculture, energy, industry, waste, and other sources each remain much smaller but have trended upward over time. Energy and industry climbed from near zero in the mid‑century to roughly 0.004-0.005 megatonnes by recent years. Waste has increased steadily since the 1990s, reaching a similar scale, while the "other" category grew until the early 2000s and then leveled off around 0.004 megatonnes. Overall, the non‑agricultural sources now collectively account for a meaningful minority of emissions.
Outlook And Priorities
Today, agriculture is broadly stable to slightly declining, while energy, industry, and waste have risen modestly; "other" appears steady. To reduce national N2O, consolidating the gradual easing in agriculture and reversing the upward drift in energy, industry, and waste will matter most, while maintaining stability in the other sources.
Background
The chart shows a national breakdown by source of the yearly nitrous oxide (N2O) emissions from human activities and processes, expressed as weight in megatonnes (Mt). Human-induced emissions are the main driver of the increasing atmospheric nitrous oxide that is warming our planet. The sources of human nitrous oxide emissions are
- Agriculture
- Energy
- Industry
- Waste
- Other
Agriculture
Emissions related to agriculture are mainly from the use of synthetic fertilizers and manure management.
Synthetic fertilizer, used for agricultural processes, contains a lot of nitrogen. That nitrogen in the soil reacts and causes considerable N2O emissions. The use of excess fertilizer, meaning more fertilizer than the plants can use to grow, causes even higher relative emissions. Applying the right amount of fertilizer at the right time can reduce N2O emissions. There are many technical solutions to reduce emissions while keeping, or even increasing, agricultural yields.
When manure is left on the field or otherwise managed in dry processes, it emits considerable amounts of nitrous oxide. Manure can be managed by wet processes, which reduces nitrous oxide emissions but increases methane emissions. Some technical solutions focus on modifying the animal feed to reduce the nitrogen in the manure, thereby reducing nitrous oxide emissions.
Energy, Industry, Waste, and Other
All non-agricultural categories together have much lower emissions than agricultural emissions alone.
N2O emissions related to energy are almost all from the combustion of fossil fuels. For example, the combustion of fossil fuels in power plants, cars, and airplanes not only causes CO2 emissions but also emits nitrous oxide (N2O). Any advances to reducing fossil fuel dependency will thus also reduce nitrous oxide emissions.
Most industry-related emissions are from the chemical industry for producing fertilizer, nylon, and similar products. Technologies are available to reduce emissions in these processes.
Nitrous oxide emissions from waste come from, for example, wastewater treatment and landfills.
Wikipedia: Nitrous oxideIPCC: AR6, 5.16 Anthropogenic nitrous oxide (N2O) emissions
Units and Measures
N2O emissions are expressed in the total weight in megatonnes per year. 1 Megatonne is equal to 1 million tonnes.
Wikipedia: MegatonneWikipedia: Global warming potential
About the Data
The last available year in all the emission datasets is 2023. N2O emissions come from the PRIMAP-Hist dataset. It is a rich dataset that combines several published sources to create a historical emissions time series for various greenhouse gases.
The Key Insights paragraph was created using a large language model (LLM) in combination with our data, historic events, and a structured approach for best accuracy by separating the context generation from the interpretation and narrative.
Data Sources
PRIMAP-hist The PRIMAP-hist national historical emissions time series (1750-2023)
Update cycle: Every few monthsDelay: Less than 1 yearCredits: Gütschow, Johannes; Busch, Daniel; Pflüger, Mika (2024): The PRIMAP-hist national historical emissions time series (1750-2023) v2.6. Zenodo.