On the maps we use every day, oceans often appear as a blue void between continents. But that appearance deceives: below the surface and along its routes, a growing share of the world economy is being played out. Container ships, fiber-optic cables, fish stocks, and future seabed mines turn the sea into a scene of competition and cooperation that rarely makes headlines.
More than 90% of world trade by volume travels by sea, and the ocean economy could double in value in the coming decades, according to international organizations' estimates.
A Liquid Frontier in Expansion
The so-called blue economy ranges from traditional fishing to wave energy generation, including maritime transport, coastal tourism, and marine biotechnology. While oceans cover 70% of the planet's surface, their contribution to global GDP remains modest but grows at an accelerating pace. Governments and companies have begun to look at the sea as a new territory for expansion.
The pandemic and recent conflicts taught us that supply chains are vulnerable. Ports have become strategic nodes, and maritime routes, objects of dispute. But the novelty is that attention is no longer limited to classic canals like Suez or Panama. The search for resources on the seabed, floating wind farms, and biodiversity protection open a new board.
Race for the Seabed
On the ocean floor lie polymetallic nodules rich in cobalt, nickel, and manganese, essential elements for electric vehicle batteries and the energy transition. The International Seabed Authority, a UN-created body, has been negotiating rules for deep-sea mining in international waters for years. Some companies and countries push to accelerate, while environmental organizations warn of risks to still little-known ecosystems.
What is deep-sea mining?
It is the extraction of minerals from the ocean floor, at depths between 1,000 and 6,000 meters. It is not yet carried out on a commercial scale, but its potential is enormous and its ecological impact, uncertain.
Fisheries and the Future of Food Security
About three billion people depend on fish as their primary protein source, according to FAO. Overfishing and climate change pressure fishing grounds, while new aquaculture and precision fishing technologies attempt to make marine exploitation more sustainable. Satellite traceability and data analysis help monitor illegal activity, but there is still a long way to go to achieve balanced management.
Energy from the Sea
Tides, waves, and temperature differences between water layers are clean and predictable energy sources. Wave and tidal energy projects, though still costly, are advancing in countries like the UK, Canada, and France. Moreover, floating wind farms open the possibility of installing turbines in deep waters, where winds blow stronger. Electricity born at sea could power entire coastal regions in the future.
The Sea as a Diplomatic Battlefield
The law of the sea, defined by the 1982 UN Convention, establishes exclusive economic zones of up to 200 nautical miles from the coast. In those waters, states have rights over resources. But disputes over islands and maritime boundaries remain latent, from the South China Sea to the Arctic. The blue economy adds a layer of complexity to those disputes, as it increases the value of submerged territories.
A Future That Must Be Sustainable
The ocean economy is not just an economic opportunity; it is also an ethical challenge. The sea regulates climate, produces oxygen, and hosts unique biodiversity. If exploitation advances without clear rules, the ecological cost could be irreversible. Therefore, international bodies and agreements like the High Seas Treaty, signed in 2023, aim to protect 30% of oceans by 2030. The question is whether political will will match the words.
What Does This Mean for the World?
Oceans are the new frontier of the global economy, but also a mirror of our contradictions. While we seek resources in the sea for the energy transition, we risk damaging the ecosystem that most contributes to life on Earth. The blue economy is not an inevitable destination, but a choice. It will depend on governments, companies, and citizens to decide whether the pulse of the oceans beats to the rhythm of sustainable development or that of unbridled exploitation.