Urea: Emissions
The CO2 that comes back out in the field
What this tab covers The greenhouse-gas footprint per tonne, split by lifecycle phase (feedstock, production, movement, use, end of life), the global total, other environmental impacts, levers and low-carbon routes, India's position, and where the investment opportunity lies. Emission intensity 1.00 t CO2e per t range about 0.5-2.3 · 0.567 t NH3 x IEA world average 2.4 t CO2 per t NH3, less 0.733 t CO2 bound into urea, plus upstream fuel supply and urea-plant energy; gas plants about 0.5-0.8, coal plants about 1.8-2.3 Global emissions per year 200 Mt CO2e per year 2024 · about 201 Mt x about 1.0 t CO2e per t, cradle-to-gate; field release of bound CO2 adds about 147 Mt and N2O morePer t of urea, cradle-to-gate plus delivery (field emissions shown under Use). Intensity: IEA Ammonia Technology Roadmap (2021); stoichiometry (indicative). Global total: IFA output; indicative intensity.
Share of footprint by lifecycle phase
Feedstock 17% Production / process 78% Movement 5%Footprint by lifecycle phase
| Phase | Intensity | Share | Main sources of emissions | Notes | Source |
|---|---|---|---|---|---|
| Feedstock | about 0.15-0.2 t CO2e per t | 17% | methane leaks and energy in gas and coal supply | basin dependent | indicative |
| Production / process | about 0.75-0.8 t CO2e per t net of the 0.733 t CO2 bound in the product | 78% | ammonia synthesis, urea plant steam | the bound CO2 is only delayed, not avoided | IEA (2021); stoichiometry (indicative) |
| Movement | about 0.05 t CO2e per t | 5% | bulk shipping and trucking | movement is 2.6% of the synthetic N chain (Menegat et al. 2022) | Menegat et al. (2022); indicative |
| Use | 0.733 t CO2 per t from hydrolysis, plus about 2 t CO2e per t from soil N2O (indicative, basis: IPCC 1% direct emission factor x 0.46 t N x 44/28 x GWP 273, plus indirect) | – | urea hydrolysis in soil; nitrification and denitrification | field use is about 58.6% of the synthetic N fertiliser chain's footprint (Menegat et al. 2022) | IPCC 2006/2019 guidelines; IPCC AR6; Menegat et al. (2022) |
| End of life | not applicable | – | nitrogen ends in crops, soils, water and air | losses counted under Use | not applicable |
Other environmental impacts
Ammonia volatilisation from surface-applied urea (often 10-30% of N in hot climates, indicative) forms fine particles; nitrate leaching contaminates groundwater; overuse in India, encouraged by the low fixed price, skews nutrient balance against phosphorus and potash.
Levers to cut emissions
- Urease and nitrification inhibitors, coated urea and deep placement to cut losses and N2O
- Rebalance India's NPK use by narrowing the price gap between urea and other nutrients
- Blue ammonia with retained CO2 for urea, or green ammonia with captured or biogenic CO2
- Replace India's older units (27 of 33 over 25 years) with efficient plants
- Biological nitrogen fixation and legumes to cut synthetic demand
India
India accounted for 14.7% of world fertiliser-N emissions in 2018 (165.5 Mt CO2e), mostly from field use (Menegat et al. 2022). Its gas-based urea plants are efficient by world standards, but Talcher's coal gasification will raise average plant intensity.
Emission figures are indicative global averages from the life-cycle studies named; actual footprints vary widely by site, energy mix and method.Low-carbon routes
| Route | Intensity | Cost premium | Status | Source |
|---|---|---|---|---|
| Urea from green ammonia plus biogenic or captured CO2 | about 0.1-0.3 t CO2e per t at the gate (indicative); field emissions unchanged | green ammonia at about 10-45% over grey (India SECI 2025) plus CO2 supply cost | no large plant; green ammonia in India goes to phosphate and complex fertilisers first | SECI via ESMAP (2025); indicative |
| Enhanced-efficiency urea (inhibitors, coatings) | cuts field N2O and volatilisation; reported reductions vary widely (indicative) | small per tonne | commercial in the EU and US; neem coating universal in India | indicative |