As we gather in Belém for COP30, in a region shaped by rainforest, river, and ocean, we call on all leaders to recognize the ocean’s vital role, alongside forests, as a regulator of global climate. This year, following the momentum of the Third UN Ocean Conference (UNOC3), the Nice Ocean Action Plan, and Blue NDC Challenge, as well as the recent success of the High Seas Treaty, we have a unique opportunity to firmly embed comprehensive ocean solutions into climate ambition, biodiversity goals, and sustainable development strategies.