The ESG Paradox in Deep-Sea Mining Financing
A critical review of the Benefit-Sharing Mechanism as a pillar of sustainable investment under the United Nations Convention on the Law of the Sea.
A green transition mines the deepest floor on Earth
Demand for cobalt, nickel, lithium, manganese and copper could quadruple by 2040, and rise sixfold under a full net-zero transition by 2050. Terrestrial supply cannot keep pace, so the international community has turned to the seabed beyond national jurisdiction — the Area — governed by UNCLOS 1982 and the International Seabed Authority.
DSM enters the ESG narrative
Project sponsors market seabed extraction as more responsible than land mining, positioning it for green bonds and multilateral finance. Yet the claim collides with documented risks of severe, potentially irreversible harm to deep-sea ecosystems.
The Area belongs to no one — and everyone
Article 136 UNCLOS declares the Area and its resources the common heritage of mankind, barring sovereign or proprietary claims. The ISA is the sole body authorized to regulate, supervise and license activity there, for the benefit of humankind as a whole.
The ESG Paradox
ESG capital, meant to mitigate risk, instead legitimizes activity that is environmentally uncertain, socially inequitable, and governance-deficient. The paradox is not accidental — it is structurally produced by the deep-sea context itself.
Framed as sustainable
- Marketed as the "green" alternative to terrestrial mining
- TMC claims a 70–99% reduction in most lifecycle impacts
- Attracts sustainability-focused institutional capital
- Positioned inside the energy-transition agenda
Structurally contested
- Recovery from disturbance may take centuries to millennia
- "No net loss of biodiversity" is likely impossible
- Greenwashing outpaces scientific verification
- No commercial project has ever entered production
ESG sits between binding ocean law and voluntary finance
Not one coherent regime, but a fragmented normative field. Voluntary instruments shape the language; UNCLOS and the ISA Mining Code form the binding floor — yet the rules for exploitation remain unfinished as of March 2026.
Standards without thresholds
Draft Regulation 44 requires the precautionary approach, best available techniques, EIS and EMMP. But the Draft Regulations stay unadopted and the environmental thresholds they reference are unfinalized — so the "E" remains a speculative claim, not a measurable constraint.
Equity that never lands
The equity mandate flows from the common heritage principle, yet operational benefit-sharing detail stays bracketed in the negotiating text. No robust FPIC mechanism exists for the diffuse global "community" the deep sea belongs to.
Regulator and promoter at once
The ISA must both regulate mining and promote seabed development. With 75%+ of income from assessed contributions, its fiscal survival is structurally tethered to the start of commercial extraction it is meant to police.
Lower cost to breach
A compliance committee and monetary penalties are contemplated but unresolved; "proper measures" against unpaid royalties stay undefined. ESG violations here carry lower expected cost than in securities-regulated terrestrial mining.
Deep-sea mining is financially volatile, legally uncertain, and fundamentally incompatible with credible ESG principles.— Greenpeace USA · 2025 Underwater Minerals Conference
Three pillars, three structural failures
Environmental
ESG capital accelerates toward a frontier whose ecological baseline is unmapped. Over 50% of the Clarion-Clipperton Zone remains poorly studied, and no remediation technology exists for the deep seabed.
Social
The "community" is a global commons with no local constituency to grant consent. The average Pacific Island State is expected to receive merely US$46,000 per year in the medium term.
Governance
A dual mandate the UK Parliament called a "clear conflict of interest" as early as 2019. Fiscal dependence on future mining revenue embeds the incentive to expedite over scrutinize.
Can benefit-sharing answer the paradox?
Rooted in Articles 136, 137, 140 and 160(2)(f)(i) of UNCLOS, the BSM is positioned to bridge exploitation and global justice. Tested on three fronts, its effectiveness remains limited.
Substantive
ISA discourse fixates on payment systems and royalties, while technology transfer, capacity building and scientific research go neglected. No finalized distribution formula exists. The Solwara 1 project in Papua New Guinea — promoted as a breakthrough — ended in bankruptcy and public financial loss, never reaching operation.
Distributive
Capability and capital concentrate in the multinational contractor even where a sponsoring state formally represents the developing world. Benefits concentrate; risks globalize. The distribution of gains and the distribution of ecological risk are not in balance.
Procedural
Nauru's invocation of the Two-Year Rule in 2021 showed a single sponsoring state, relaying a private contractor's priorities, pressuring a body meant to act for humankind. Civil society, independent scientists and coastal communities remain comparatively unheard.
Reform on three interconnected fronts
Without substantial reform before commercial exploitation begins, the BSM risks serving as normative justification for extraction rather than an effective pillar of sustainable investment.
Independent baselines
Require independently verified baseline data before any EIS and EMMP are approved under Draft Regulation 44 and Annex IV.
Transparent formula
Adopt a transparent benefit-allocation formula under Article 160(2)(f)(i), backed by auditable technology-transfer commitments.
Real accountability
Build an independent compliance mechanism, stronger disclosure, and broader participation of independent scientists and affected stakeholders.
Legitimacy, not just legality
The growing demand for critical minerals has framed DSM as an ESG-aligned investment. This study finds its financing still marked by environmental uncertainty, distributive inequity and governance deficiency. The Benefit-Sharing Mechanism, meant to operationalize the Common Heritage of Mankind principle, remains limited in substantive, distributive and procedural justice — and without reform, risks becoming a source of normative legitimacy rather than an effective pillar of sustainable investment.