The ocean covers 70 percent of Earth’s surface and acts as a vast storehouse for both carbon dioxide and heat, amongst providing other ecosystem services vital to humanity. Whilst climate change imperils marine life, the ocean is increasingly recognized as providing opportunities for solutions in the fight against climate change. This updated report lays out a series of feasible, ready-to implement, scalable ocean-based solutions to climate change that can be pursued now. It also examines emerging technologies that may offer opportunity for combatting climate change in the near future.