Uranium: Impact on nature
Low carbon, but tailings and spent fuel linger
What this tab covers What taking energy from this source does to land, water, air and climate, wildlife and ecosystems, with life-cycle emissions and land use where measured.Fission has among the lowest life-cycle emissions and land use of any source. Its burdens are radioactive: mill tailings and mine water at the front end, and long-lived spent fuel at the back end.
Life-cycle emissions 5.1-6.4 g CO2e/kWh11 Life-cycle range, UNECE (2021/22). IPCC AR5 gives a median of 12 with a range of 3.7-110 (source 15); its range is wider because it pools older studies with more energy-intensive enrichment Land use 7.1 (median) ha per TWh per year14Effects on nature
| Area | Effect | Size | How it is reduced |
|---|---|---|---|
| Climate | Emissions come mainly from mining, milling, conversion and enrichment11 | 5.1-6.4 g CO2e/kWh (UNECE 2021) | Low-carbon electricity for enrichment (centrifuges rather than diffusion) |
| Mining waste | Mill tailings keep 80-90% of the ore's radioactivity (radium and its decay products) plus process chemicals12 | More than half of the small abandoned mid-20th-century uranium mines on Navajo lands in the US still have their wastes in place | Engineered tailings impoundments, covers and long-term monitoring |
| Groundwater | In-situ leaching pumps chemicals into aquifers to dissolve uranium6 | 55% of world uranium came from in-situ leaching in 2024 | Restoration of aquifers after mining, confined ore horizons |
| Air (radon) | Radon gas from radium decay accumulates in underground mines12 | Low risk at open pits and leaching sites where it disperses | Mine ventilation, dose monitoring |
| Spent fuel and high-level waste | Highly radioactive, long-lived waste requiring isolation for millennia13 | About 450,000 t of used fuel produced since the 1950s; under 3% of waste volume but 95% of radioactivity | Deep geological disposal; reprocessing |
| Land | Very small footprint per unit of energy14 | Median 7.1 ha per TWh per year, the lowest of all sources | Not usually needed |
Most of the physical disturbance from fission happens at the mine, which is small per unit of energy because so little fuel is needed. The distinctive problem is long-lived radioactivity. Spent fuel is small in volume but must be isolated for many thousands of years. Finland granted the world's first operating licence for a deep geological repository, at Olkiluoto, on 22 October 2026, with disposal awaiting final regulatory tests. Accidents, though rare, can contaminate large areas, which is a separate matter from routine environmental impact.
Sources
- World Uranium Mining Production World Nuclear Association, 2025
- Carbon Neutrality in the UNECE Region: Integrated Life-cycle Assessment of Electricity Sources (executive summary: nuclear 5.1-6.4 g CO2 eq./kWh) United Nations Economic Commission for Europe (UNECE), 2022
- Radioactive Waste From Uranium Mining and Milling US Environmental Protection Agency (RadTown), 2024
- What is nuclear waste and what do we do with it? World Nuclear Association, 2025
- What are the land-use intensities of different energy sources? (summarising Lovering et al., PLOS ONE 2022) The Breakthrough Institute, 2022