Our planet is 30% land and 70% oceans. Climate change represents the greatest collective challenge of our time, and is a direct result of excess carbon emissions to the tune of 2,000 gigatons. The removal of carbon dioxide is critical, if humanity is to have a chance to turn the tide on climate change. While land-based solutions are well known and discussed, Earth’s oceans provide the best pathway for permanent gigaton-scale carbon removal (CR) that can be deployed quickly. Oceans naturally remove CO2, cycling it to the deep ocean in a safe and permanent form. Blue carbon, iron fertilization, electrochemistry, and alkalinization represent a few ocean-based CR pathways. Maximizing ocean productivity and reducing ocean acidity through protection and conservation efforts will also be key.