The OOS2025 programme has been launched!
Programme by session Session overview by day Presenter guidelines
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The Ocean’s Greatest Challenges
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There is One Ocean
There is One Ocean, a global common and a critical resource to human prosperity and well-being. It plays a crucial role in regulating the climate and supporting the livelihoods of three billion people, the vast majority in developing countries.
Climate change, overfishing, pollution, and conflict use
The Ocean is under threat from combined pressures such as climate change, overfishing, pollution, and conflicting uses. It is also a source of solutions, for example to mitigate and adapt to climate change.The Ocean urgently needs decisive, swift, and unified efforts to address its critical condition and maximize the solutions it offers. This presents a major challenge for the global community at the Third United Nations Conference on the Oceans (UNOC3), to be held in Nice from 9 to 13 June 2025. The goal is to spur action and implement SDG 14, which is the least funded of all Sustainable Development Goals.
A UNOC3 Special Event dedicated to Science
CNRS and IFREMER have been tasked with organizing the One Ocean Science Congress (OOSC), a UNOC3 Special Event dedicated to Science, and to provide Heads of State, Government, and the broader society, with comprehensive scientific insights on the Ocean's health and future trajectory. Science-informed decisions should enable the conservation and sustainable use of the Ocean, optimize the solutions it offers, and safeguard the services and benefits it provides to humanity.
To learn more about the Third United Nations Ocean Conference: UNOCNICE2025
About the One Ocean Science Congress
The Congress will feature a mix of plenary sessions, including opening and keynote speeches, alongside parallel oral and poster presentations. To enhance interactions between science and society, action and policy, and to engage civil society more broadly, 'townhalls' such as panels and roundtables will also be arranged.
The International One Ocean Science Congress in Numbers
- Over 2,000 scientists from around the world gathered
- 33 town halls (roundtable discussions)
- 3 keynote sessions, each featuring 9 distinguished speakers, broadcast live
- 500 oral presentations
- 620 scientific posters at La Baleine
- 1 opening ceremony streamed live
- 1 Arts & Science evening event, For The Ocean, at the Nice Opera House
- 4 international ambassadors to carry the voice of science and the Ocean
Four Ambassadors to Carry the Ocean’s Voice to the Highest Level
Prominent figures from diverse backgrounds, each deeply committed to ocean protection, will serve as ambassadors for the international One Ocean Science Congress.
Alejandra Villalobos Madrigal is the Executive Director of Amigos Isla de Coco (Faico), a non-profit NGO established in Costa Rica in 1994. Its mission is to mobilise and implement human, technical, and financial resources to support the effective management of the Cocos Marine Conservation Area and the surrounding critical ecosystems of the Eastern Tropical Pacific. For 30 years, Faico has successfully united key local, regional, and international stakeholders, embodying a strategic partnership model that has inspired marine conservation initiatives around the world.
Olivier Roellinger is a three-starred French chef, Knight of the Legion of Honour, and Commander of the Order of Arts and Letters. Based in Cancale, he is renowned for his dedication to the quality and origin of the products he uses, particularly seafood. He actively advocates for responsible fishing and marine ecosystem protection, notably through his work as a patron of the NGO Ethic Ocean.
Princess Lātūfuipeka Tukuʻaho of Tonga represents a South Pacific Polynesian nation composed of over 170 islands. She will give voice to the island communities on the front lines of climate change impacts, such as rising sea levels. She stands for the traditional knowledge of island peoples and supports climate justice.
Boris Herrmann is a professional sailor. In 2020, he became the first German to participate in the Vendée Globe, finishing in 5th place. Since 2018, he has led the campaign A Race We Must Win, combining sailing, science, and education. Onboard his racing boat, he carries a laboratory that collects vital ocean data in partnership with the Max Planck Institute for Meteorology, GEOMAR, and IFREMER. Through the My Ocean Challenge programme, his professional sailing team, Team Malizia, educates children around the world about the ocean and climate change.
News
Prior to the UNOC 3 conference to occur in Nice on June 9th-13th 2025, in partnership with Côte d’Azur University, Western Brittany University, Sorbonne University and the French Network of Marine Universities, the First International Forum of Marine Universities will be organized.
This International Forum will gather worldwide universities with the objective to “Reinforce transmission of knowledge and education to improve scientific training and enhance awareness of civil society to face ocean challenges”.
To attend the Forum a free registration is required. Please register here:
https://lime3-app3.sorbonne-universite.fr/index.php/856254?newtest=Y&lang=fr 
Prior to the UNOC 3 conference to occur in Nice on June 9th-13th 2025, in partnership with Côte d’Azur University, Western Brittany University, Sorbonne University and the French Network of Marine Universities, the First International Forum of Marine Universities will be organized.
This International Forum will gather worldwide universities with the objective to “Reinforce transmission of knowledge and education to improve scientific training and enhance awareness of civil society to face ocean challenges”.
To attend the Forum a free registration is required. Please register here:
https://lime3-app3.sorbonne-universite.fr/index.php/856254?newtest=Y&lang=fr
In a recently published article, the co-chairs of the One Ocean Science Congress underscore the ocean’s essential role in sustaining planetary health, economic prosperity, and human well-being — while sounding the alarm on the escalating threats posed by climate change, pollution, overfishing, and weak governance.
They present the One Ocean Science Congress (3–6 June 2025) and the 3rd UN Ocean Conference (UNOC3) in Nice, France, as key milestones for advancing ocean sustainability through science-based policy, innovation, and international cooperation. Alongside the Congress, high-level events will address climate resilience and sustainable investment, all contributing to the Nice Ocean Action Plan — a joint outcome aimed at achieving SDG14 and securing a healthy, resilient ocean for future generations.
📖 Read the article here: https://www.openscience.fr/June-2025-Nice-capital-of-the-world-ocean
In a recently published article, the co-chairs of the One Ocean Science Congress underscore the ocean’s essential role in sustaining planetary health, economic prosperity, and human well-being — while sounding the alarm on the escalating threats posed by climate change, pollution, overfishing, and weak governance.
They present the One Ocean Science Congress (3–6 June 2025) and the 3rd UN Ocean Conference (UNOC3) in Nice, France, as key milestones for advancing ocean sustainability through science-based policy, innovation, and international cooperation. Alongside the Congress, high-level events will address climate resilience and sustainable investment, all contributing to the Nice Ocean Action Plan — a joint outcome aimed at achieving SDG14 and securing a healthy, resilient ocean for future generations.
📖 Read the article here: https://www.openscience.fr/June-2025-Nice-capital-of-the-world-ocean