The main concerns are concentrated in three materials. Cobalt: the Democratic Republic of Congo supplies the majority of the world's cobalt, and a portion comes from artisanal mines linked to dangerous conditions and child labour — estimates suggest tens of thousands of children may be involved. Lithium: brine extraction in South America's lithium triangle is water-intensive in already arid regions, stressing local water and ecosystems. Rare earths (used in some EV motors): processing is energy-intensive and can involve radioactive and toxic waste, often concentrated in a few countries. None of this makes EVs worse than petrol overall, but the impacts are real, and supply-chain transparency, recycling and cobalt-free chemistries are the main routes to reducing them.
The three problem materials
| Material | Used for | Main ethical/environmental concern |
|---|---|---|
| Cobalt | Many Li-ion cathodes | Artisanal mining, unsafe conditions, child labour (DRC) |
| Lithium | All Li-ion batteries | Water use in arid brine regions; community impacts |
| Rare earths | Some EV motor magnets | Toxic/radioactive processing waste; land damage |
| Nickel | High-energy cathodes | Deforestation, waste disposal (esp. Indonesia) |
Why this matters — and what it doesn't mean
EVs are cleaner than petrol or diesel over their lifecycle. But cleaner overall is not the same as clean, and the battery and motor supply chains carry genuine human-rights and environmental burdens. Being honest about them is not anti-EV — it is the only way the industry improves. The goal is fewer harms, not pretending they do not exist.
Cobalt and the DRC
The Democratic Republic of Congo hosts the world's largest cobalt reserves and supplies the majority of global production. A significant share — by some 2025 estimates up to around 60% of DRC output — comes from artisanal and small-scale mining, where conditions can be hazardous: tunnel collapses, exposure to toxic dust, and minimal safety equipment are common.
The most serious concern is child labour. Reporting and NGO estimates suggest tens of thousands of children may be involved in cobalt mining in the DRC, some very young, drawn in by poverty and the high cost of schooling. Women are often confined to the lowest-paid, highest-risk processing tasks. These are deep, structural problems rooted in poverty, not simple to fix by a single corporate pledge.
Manufacturers increasingly use cobalt-free LFP (lithium iron phosphate) batteries, which contain no cobalt at all and are now common in standard-range EVs. Supply-chain due-diligence rules (such as the EU Battery Regulation) require companies to trace and report on mineral sourcing. Industry and ILO programmes aim to formalise artisanal mining and remove children from the workforce — progress is real but uneven.
Lithium and water
Lithium comes mainly from two sources: hard-rock mining (notably Australia) and brine extraction from salt flats in South America's lithium triangle (Chile, Argentina, Bolivia). Chile alone supplies a large share of global lithium. The concern with brine is water: extraction pumps and evaporates enormous volumes of brine in some of the driest places on Earth, and there are well-documented worries about its effect on local water balance, ecosystems and Indigenous communities who depend on scarce water.
The picture is nuanced — studies debate exactly how much fresh water is consumed versus brine — but the stress on hyper-arid environments is real. Newer direct lithium extraction (DLE) methods promise much lower water use and land disturbance, and are being scaled up to reduce these impacts.
Rare earths in motors
Many (though not all) EV motors use permanent magnets containing rare-earth elements such as neodymium and dysprosium. Rare-earth mining and processing is environmentally heavy: ores are often bound up with radioactive elements, separation requires large amounts of acid and energy, and poorly managed operations have left toxic and radioactive waste, contaminated water and damaged land. Production is also geographically concentrated, raising supply-security as well as ethical questions.
Some manufacturers now use rare-earth-free motor designs (such as certain induction and externally-excited motors) to sidestep the issue entirely, and recycling of magnets is developing.
Nickel — the quieter concern
High-energy battery chemistries use nickel, and a growing share comes from Indonesia, where nickel mining and processing have been linked to deforestation, biodiversity loss and waste-disposal problems. As with the other minerals, the impact depends heavily on how responsibly a given mine and refinery operate.
How the industry is reducing the harms
| Lever | What it does |
|---|---|
| Cobalt-free LFP batteries | Removes cobalt entirely; now common in standard-range EVs |
| Battery recycling | Recovers cobalt, lithium, nickel — cuts demand for new mining |
| Due-diligence regulation | EU Battery Regulation requires sourcing traceability and reporting |
| Direct lithium extraction | Lower water use and land disturbance than evaporation ponds |
| Rare-earth-free motors | Avoid rare-earth magnets in some EV designs |
| Supply-chain audits | Track conditions and exclude worst-practice sources |
What a conscientious buyer can do
- Favour models and brands that publish supply-chain due-diligence and battery-passport information.
- Consider LFP (cobalt-free) chemistry where it suits your range needs.
- Right-size the battery — a smaller pack needs fewer critical minerals.
- Keep the car a long time and support recycling at end of life, which reduces demand for fresh mining.
- Treat marketing claims sceptically and look for third-party verification.
An honest conclusion
The mineral supply chain behind EVs has serious ethical and environmental problems that deserve scrutiny rather than denial. At the same time, the trajectory is toward fewer harms: cobalt-free chemistries are mainstream, recycling is scaling, water-efficient lithium extraction is emerging, and due-diligence rules are tightening. Petrol and diesel cars carry their own large extraction footprint from oil. The responsible position is to push the EV transition and clean up its supply chain at the same time.
Frequently asked questions
Is child labour really used in EV battery supply chains?
Can you buy an EV with no cobalt?
Does lithium mining really use a lot of water?
Do all EV motors need rare earths?
Does this mean EVs are worse than petrol cars?
Sources & further reading
- Save the Children — DRC: Cobalt mines, child labour and the green transition
- ICCT — Expanding the lithium value chain in Chile (Oct 2025)
- Mongabay — Lithium mining leaves severe impacts in Chile, but new methods exist
Figures, prices and policy details were current at the last-updated date above. Automotive pricing, incentives and regulations change frequently — verify time-sensitive details with the linked primary sources. Read our editorial policy and fact-checking standards.
