Final answer:
Higher hurricane wind speed is the threat to the ocean that is most likely NOT posed by human actions.
Step-by-step explanation:
The threat to the ocean that is most likely NOT posed by human actions is Higher hurricane wind speed. While human actions, such as pollution, damaged coral reefs, and damaged sea turtle nesting sites, can have significant negative impacts on the ocean, higher hurricane wind speed is a natural phenomenon that is not directly caused by human activities.