What is the key concept for this section? List three reasons why it is difficult to protect marine biodiversity. How have laws and treaties been used to help sustain aquatic species? What is the main...

What is the key concept for this section? List three reasons why it is difficult to protect marine biodiversity. How have laws and treaties been used to help sustain aquatic species? What is the main obstacle to enforcement of international agreements? How can economic incentives help to sustain aquatic biodiversity? Give an example of how this can happen.