Ratify Global Oceans Treaty and Continue Deep Sea Mining Moratorium

Clean environment & nature — Helps

moderate · moderate confidence

Ratifying the Global Oceans Treaty and maintaining a deep-sea mining moratorium strengthen protections for ocean biodiversity and ecosystems, with the treaty providing a legal mechanism to create marine protected areas covering up to 30% of the oceans by 2030. The main caveat is that actual environmental gains depend on how many countries ratify and implement the treaty, and whether the moratorium holds against international pressure.

The evidence

• The policy commits to ratifying the Global Oceans Treaty early in the next Parliament and continuing the moratorium on deep-sea mining. — conservatives.com (manifesto) — “The Conservative Party will ratify the Global Oceans Treaty early in the next Parliament and continue with its moratorium on deep sea mining.”
• Currently less than 1% of the high seas are fully protected, far below the 30x30 target. — green-alliance.org.uk (media) — “Currently, less than 1% of the high seas are fully protected”
• The treaty establishes a legal framework for creating marine protected areas in the high seas, which is necessary for achieving the 30x30 target — without it, there is no legal mechanism to establish MPAs on the high seas. — commonslibrary.parliament.uk (government) — “without it, there is no legal mechanism to establish MPAs on the high seas”
• The treaty framework would shield sensitive ocean habitats from harmful activities, allowing ecosystems to recover. — green-alliance.org.uk (media) — “This framework will provide the tools to shield sensitive ocean habitats from harmful activities like industrial fishing and pollution, allowing ecosystems to recover and thrive”
• Healthy oceans with diverse ecosystems can preserve vital blue carbon stores, making them more resilient to climate change. — greenpeace.org.uk (media) — “Healthy oceans, with diverse ecosystems, are more resilient to climate change, pollution, and overfishing, and can preserve vital "blue carbon" stores in habitats like mangroves and seagrass beds”
• Around 90% of species in potential deep-sea mining areas are currently unknown, meaning a moratorium protects poorly understood ecosystems. — post.parliament.uk (government) — “Around 90% of species in potential deep-sea mining areas are currently unknown”
• Scientists warn that deep-sea mining could cause permanent biodiversity loss, destroy habitats, and create sediment plumes extending far beyond mining areas. — pew.org (media) — “Scientists warn that deep-sea mining could cause permanent loss of biodiversity, destroy habitats, create extensive sediment plumes that can extend far beyond mining areas, disrupt food webs, and introduce noise, light, …”
• The moratorium provides time for scientists to gather data and for the ISA to develop robust environmental regulations. — pew.org (media) — “The moratorium provides crucial time for scientists to gather more data and better understand deep-sea ecosystems and the potential impacts of mining at commercial scales, as well as for the International Seabed Authorit…”
• Reports suggest demand for critical minerals for a renewable energy economy can be met through recycling and new battery technologies, reducing the need for deep-sea mining. — deep-sea-conservation.org (media) — “the demand for critical minerals for a 100% renewable energy economy by 2050 can be met through ambitious recycling, reduced consumption, and new battery technologies (e.g., lithium-iron-phosphate batteries which do not …”
• The treaty entered into force on 17 January 2026 after 60 countries ratified it, giving it legal effect. — greenpeace.org.uk (media) — “The Treaty officially entered into force on January 17, 2026, after 60 countries ratified it, with 75 countries having ratified by October 2025”
• The UK's moratorium stance aligns it with over 40 countries, strengthening international calls for caution at the ISA, though some nations and companies are pushing for mining to begin. — oceanographicmagazine.com (media) — “strengthens international calls for caution and improved governance within the ISA, although some nations and companies are pushing for mining to commence”

Biggest unknown: Whether enough countries ratify and enforce the treaty to meaningfully expand protected ocean areas toward the 30x30 target, and whether the deep-sea mining moratorium remains durable given geopolitical pressure from nations and companies pushing for mining to commence.

Our reading: Both components of this policy — treaty ratification and the deep-sea mining moratorium — push in the same direction for O6: ocean biodiversity protection and long-term ecosystem resilience. On the treaty: the current baseline is stark — less than 1% of the high seas are fully protected, and only around 8.3% of the global ocean is protected overall, against a 30x30 target of 30% by 2030. The House of Commons Library confirms there is no other legal mechanism to establish MPAs on the high seas; ratification is therefore a necessary (though not sufficient) condition for meaningful progress. The treaty has already entered into force with 75 ratifying countries, so UK ratification adds diplomatic weight and unlocks the UK's full participation in governance mechanisms including environmental impact assessments and the science committee. Blue carbon preservation is a co-benefit tied to ecosystem health, giving a long-term climate dimension. These are projected-tier gains — actual MPA establishment requires subsequent implementation by multiple parties — but the mechanism is legally grounded. On the moratorium: with 90% of species in potential mining zones unknown, precautionary protection is well-supported by the scientific evidence. The risk of irreversible harm (permanent biodiversity loss, sediment plumes, food web disruption) is cited by credible scientific bodies. Continuing the moratorium avoids locking in potentially irreversible damage while the ISA's regulatory framework remains unfinished and contested. The counter-argument — that deep-sea minerals are needed for the green transition — is contested by EASAC and SINTEF projections suggesting demand can be met through recycling and alternative technologies. The magnitude is moderate rather than major because actual ecosystem gains depend heavily on multilateral implementation of the treaty and the durability of the moratorium against geopolitical pressure. The UK's ISA exploration licences also create some tension with the moratorium stance. Effects are predominantly long-term given the pace of MPA establishment and ecosystem recovery timescales.