On June 3, 2025, the One Ocean Science Congress commenced in Nice, France, bringing together over 2,200 scientists from more than 110 countries to address pressing issues in marine conservation and sustainable ocean practices. Organized by the French National Centre for Scientific Research (CNRS) and the French Research Institute for Exploitation of the Sea (IFREMER), the four-day congress aims to provide a scientific foundation for the upcoming Third United Nations Ocean Conference (UNOC3) scheduled for June 9–13 in the same city.
A Global Gathering for Ocean Sustainability
The One Ocean Science Congress serves as a pivotal platform for scientists to present research and develop recommendations on key topics such as marine biodiversity, climate change impacts on oceans, and innovative conservation strategies. The congress features plenary sessions, keynote speeches, oral and poster presentations, and interactive town halls designed to foster dialogue between science, policy, and society.
“This is the first scientific conference to be held in conjunction with a United Nations conference on the ocean,” said François Houllier, CEO of IFREMER and co-chair of the congress. “Our goal is to ensure that political decisions are rooted in the best available science.”
Addressing Critical Ocean Challenges
The congress focuses on ten key themes aligned with the UN Decade of Ocean Science for Sustainable Development, including:
- Integrating diverse knowledge systems for ocean stewardship
- Combating illegal, unreported, and unregulated fishing
- Enhancing ocean observation and data sharing
- Promoting equitable access to marine resources
- Strengthening ocean governance and legal frameworks
These themes are designed to inform the Ocean Action Panels of UNOC3 and support the development of the Nice Ocean Action Plan, which aims to accelerate action on Sustainable Development Goal 14: Life Below Water.
Scientific Insights to Inform Policy
The congress’s outcomes will contribute to the scientific recommendations presented at UNOC3, where over 60 world leaders, 4,000 government officials, and 6,000 civil society participants are expected to convene. Key goals of the conference include securing $100 billion in commitments for ocean conservation, promoting the ratification of the 2023 high seas biodiversity treaty, and advancing efforts to protect 30% of ocean waters by 2030.
“We need to take the principles of the Blue Economy and Finance Forum to heart and really change our mindset so that we think about marine conservation as a business opportunity,” said Kristin Rechberger, founder of Dynamic Planet. “Quickly pivot and align everything we can to change the game.”
Emphasizing the Role of Science in Ocean Governance
The One Ocean Science Congress underscores the importance of science in shaping effective ocean governance. By bringing together a diverse array of experts, the congress aims to bridge the gap between scientific research and policy implementation. The event also highlights the need for increased investment in ocean science, particularly in areas such as marine protected areas, sustainable fisheries, and climate resilience.
“The ocean needs science, all of science,” said Antoine Petit, CEO of CNRS. “It’s a major challenge for the sustainability of our planet.”
Looking Ahead
As the One Ocean Science Congress continues through June 6, participants remain focused on generating actionable insights to inform global discussions on ocean sustainability. The congress’s findings will play a crucial role in shaping the outcomes of UNOC3 and advancing international efforts to protect and preserve the world’s oceans for future generations.
