Cobalt: Emissions
From hydroxide to metal, the footprint climbs
What this tab covers The greenhouse-gas footprint of the commodity at a global level, split by lifecycle phase: extraction (or farming), refining and processing, movement, usage, and recycling or end of life. Intensities are per unit of product; the global total combines intensity with world output. Also covers other environmental impacts and the main levers to cut emissions. Emission intensity 28.2 t CO2e per t range per t of product: crude hydroxide 6.4, sulphate heptahydrate 4.0, tetroxide 24.0, metal 28.2 · cradle-to-gate, industry average, Cobalt Institute members, 2019 data Global emissions per year 6.00 Mt CO2e per year 2025 · about 240 kt refined cobalt x 20-28 t CO2e per t Co contained (indicative)Per t of refined cobalt metal; cradle-to-gate (CI reference year 2019). Intensity: Cobalt Institute Life Cycle Assessment (2019 reference year). Global total: Cobalt Institute 2025 (refined output); Cobalt Institute LCA.
Share of footprint by lifecycle phase
Extraction 65% Refining / processing 31% Movement 4%Footprint by lifecycle phase
| Phase | Intensity | Share | Main sources of emissions | Notes | Source |
|---|---|---|---|---|---|
| Extraction | about 18 t CO2e per t Co contained in hydroxide (indicative: 6.4 per t hydroxide at about 35% Co) | 65% | diesel, grid and generator power at DRC mines; sulphuric acid and lime; HPAL in Indonesia runs on coal power | Allocation with copper or nickel matters. Indonesian HPAL on captive coal is likely higher than DRC hydropower-based output (indicative). | Cobalt Institute LCA; share indicative |
| Refining / processing | about 9 t CO2e/t (indicative balance to the 28.2 metal figure) | 31% | Chinese refinery power and reagents; electrowinning for metal | Electricity and chemicals are the main hotspots. | Cobalt Institute LCA; share indicative |
| Movement | about 0.8-1.3 t CO2e/t | 4% | trucking from the Copperbelt to ports; shipping to China | Transport is 2.8-4.6% of product GWP. | Cobalt Institute LCA |
| Usage | none directly; enables EV batteries and efficient jet engines | – | battery cathodes, superalloys | Not applicable as a direct source. | Not applicable |
| Recycling / end of life | lower than primary; no CI figure published | – | hydrometallurgy of black mass and superalloy scrap | EU end-of-life recycling input rate is 22%; US scrap was 25% of consumption in 2025. | EU CRM 2023; USGS MCS 2026 |
Other environmental impacts
Artisanal mining in the DRC, nearly a third of national output by one estimate, carries child-labour and safety risks. Acid-leach tailings and HPAL residue storage in Indonesia raise water and biodiversity concerns.
Levers to cut emissions
- Renewable or hydro power for DRC mines and Indonesian HPAL in place of captive coal
- Refining closer to mines with clean power, shortening the DRC-China chain
- Battery recycling, which already supplies about 10% of cobalt
- Lower-cobalt and cobalt-free chemistries (LFP) that cut cobalt per kWh
India
India has no cobalt mine output and little refining; it imports cobalt chemicals, mainly via China. Cobalt is on India's 2023 critical minerals list and KABIL is seeking overseas assets.
Emission figures are indicative global averages from the life-cycle studies named; actual footprints vary widely by site, energy mix and method.