2016 marks the fifth year of annual global Ocean Health Index (OHI) assessments, with scores representing ocean health for 220 coastal nations and territories. Completing the fifth consecutive year of the global ocean health assessment provided an opportunity to explore trends and trajectories in ocean health as well as assess how well the Ocean Health Index has performed as an indicator.

Halpern et al. 2017, PLoS ONEinteractive figures and mapsOpen Channels webinar

The average 2016 Index score was 71 out of 100.
Average Index scores have not dramatically changed over five years, which could be expected at a global scale. However, some individual goals and regions have had significant changes.

The OHI framework has not changed since its inception in 2012 (Halpern et al. 2012). We continue to assess ocean health based on the sustainable delivery of 10 goals that are of importance to humans. We score each goal on a scale of 0-100 based on current status, trend, and external pressures and resilience measures. Scores are calculated for each coastal nation before being combined together. However, the OHI benefits from constant evaluation and improvement aimed at incorporating new knowledge, data and understanding, and underlying methods for some goals have been upgraded.
For further details, see Halpern et al. 2015, Halpern et al. 2017, Lowndes et al. 2015, and Lowndes et al. 2017.

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