Though the ocean covers more than two-thirds of our planet, produces roughly half of the oxygen we breathe, and has sequestered over 40% of the carbon dioxide emitted since the dawn of the industrial revolution, its contributions to ameliorating the global climate crisis are regularly overlooked; the full text of the Paris Climate Accord includes the word “ocean” exactly once. We tend to think of the warming, acidifying, rising ocean as a victim of climate change when in fact it’s poised to be a hero, with natural systems that help undo the damage human activity has caused.