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Measuring ocean sustainability with the ocean footprint: pathways to ocean overshoot day and blue finance
Summary
Scientists created a new tool called the "Ocean Footprint" to measure how much we're overusing the ocean's resources compared to how fast it can naturally recover—similar to how we track carbon footprints for climate change. The study found that most countries, including Brazil (the main case studied), are taking more from the ocean than it can replenish, largely due to offshore oil drilling and plastic pollution, meaning we're using up a year's worth of "ocean budget" before the year even ends. This matters for your health because an overexploited ocean means more plastic pollution ending up in seafood and eventually in our bodies, plus fewer healthy
Assessing ocean sustainability requires indicators that link human demand to the regenerative capacity of marine ecosystems. Existing tools, such as the Ecological Footprint and the Ocean Health Index, provide valuable insights but do not explicitly quantify ocean resource appropriation in biophysical terms or consistently connect demand, ecological limits, and responsibility. This study proposes the Ocean Footprint (OF), an emergy-based indicator that integrates major blue economy sectors and introduces three complementary metrics: Ocean Carrying Capacity (OCC), Ocean Responsibility Balance in Emergy (ORBEM), and Ocean Overshoot Day (OODay). The framework is applied at the national scale, using Brazil as a primary case study, and is complemented by cross-country comparisons. Results indicate that Brazil’s ocean-related demand substantially exceeds its domestic regenerative capacity, resulting in a significant ecological deficit driven mainly by offshore oil extraction and plastic pollution. Comparative analysis shows that most countries operate under oceanic deficit conditions, with limited cases of ecological surplus. The OODay metric further reveals that, under current consumption patterns, national and global ocean limits are exceeded within the year. The proposed framework provides a biophysically grounded, operational approach to assessing ocean sustainability, supporting the identification of key pressure drivers and enabling the integration of ecological constraints into policy and decision-making, particularly in the context of the blue economy and ocean governance.