The ocean is essential to life on Earth. It covers most of the planet, connects every ocean basin and influences the air, water, food and climate on which people and ecosystems depend. Protecting the ocean is therefore not only a marine issue; it is fundamental to human well-being and a sustainable future.
The ocean helps regulate climate
Ocean water stores and transports enormous amounts of heat. Currents redistribute warmth from the tropics toward higher latitudes and help shape regional weather. The ocean also absorbs a substantial share of the excess heat generated by human-driven climate change, reducing short-term atmospheric warming but causing ocean warming, sea-level rise and stress for marine ecosystems.
It supports the oxygen and carbon cycles
Microscopic photosynthetic organisms in the ocean contribute a large share of the oxygen produced on Earth. The ocean also exchanges carbon dioxide with the atmosphere and stores carbon in water, living organisms and sediments. These processes connect marine health directly with the stability of the global climate system.
The ocean is Earth’s largest living space
From sunlit coasts and coral reefs to the deep seabed, the ocean contains an extraordinary range of habitats. Marine biodiversity supports food webs, nutrient cycles and ecosystem services. Many species remain unknown, which means the ocean also holds scientific knowledge and potential discoveries that have not yet been explored.
People depend on a healthy ocean
Billions of people rely on seafood, coastal livelihoods, maritime transport and tourism. Coastal ecosystems such as mangroves, seagrass meadows and reefs can reduce wave energy, store carbon and provide nurseries for marine life. The ocean also carries cultural, educational and spiritual value for communities around the world.
Why the ocean needs protection
Climate change, pollution, habitat loss and unsustainable use are placing the ocean under pressure. Science-based management, protected and restored ecosystems, lower greenhouse-gas emissions, responsible production and greater ocean literacy can help reverse decline. Every community is connected to the ocean, even far from the coast, because rivers, climate, consumption and the water cycle link land and sea.