The graph below comes from The Ecological Fishprint of Nations report by Redefining Progress. It tracks the global fishprint (a measure of the ocean area needed to produce the fish catch in hectares per metric ton of fish, weighted to reflect the ecological productivity of particular biomes) against global biocapacity (a measure of the ocean’s ability to supply a steady quantity of fish based on the producer productivity in ocean ecosystems and also expressed in terms of area).
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Hint: To answer some of the questions below it might help to access the actual report.