The point is that the oceans are large, there are different concerns, and conditions vary across location and species.
If you want to answer a question like "how healthy are our oceans?" you need to first work out what that might mean, and then measure that systematically like the project I linked you to.
The point is that the oceans are large, there are different concerns, and conditions vary across location and species.
If you want to answer a question like "how healthy are our oceans?" you need to first work out what that might mean, and then measure that systematically like the project I linked you to.