The ocean is one of our greatest allies in the fight against climate change — regulating temperature, storing carbon, and sustaining life on Earth. Yet this vital system is under severe threat from rising greenhouse gas emissions. In this video, Callum Roberts, Professor of Marine Conservation at the University of Exeter, explains why rapid decarbonisation is essential to protect ocean health and secure a habitable future.

Roberts describes the ocean as a “planetary air conditioner,” absorbing excess heat and carbon that would otherwise destabilise our climate. But these services have limits. Without urgent action to transition to renewable energy, reduce fossil fuel dependence, and adopt sustainable industry practices, we risk crossing tipping points that could accelerate climate breakdown.

Scientists can catalyse knowledge into action by working closely with policymakers, businesses, and communities. Preserving ocean health is inseparable from achieving net zero — and from safeguarding the future of both people and planet.