Ocean-Based Carbon Dioxide Removal: A New Frontier in the Blue Economy

The ocean is a key facet of climate stability and Earth's carbon cycle. Given the immense scale of atmospheric carbon dioxide removal (CDR) necessary to achieve international climate goals, ocean-based CDR approaches (or "ocean CDR") warrant serious consideration. Ocean CDR is a still nascent, but cautiously promising, area of scientific research with several approaches under evaluation. Here, we examine one of the most promising approaches, ocean alkalinity enhancement, to highlight and exemplify challenges and opportunities of an emerging ocean CDR industry in the blue economy.