An index assessing the health of the oceans gives a global score of 60 out of 100. But the idea that a single number can encompass both environmental status and the benefits that the oceans provide for humans may prove controversial. See Article p.615
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References
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Tittensor, D. Scorecard for the seas. Nature 488, 594–595 (2012). https://doi.org/10.1038/488594a
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DOI: https://doi.org/10.1038/488594a