There are more than 15,000 marine protected areas in the world, and most of the protected areas allow commercial activities. Human beings have fully utilized or even overexploited 89% of the world's fish resources and destroyed nearly half of the world's coral reefs. Scientists believe that To protect the healthy diversity of marine life, at least 30% of the world's oceans need to be assigned to protected areas. It is important that most protected areas be close to the prosperous coast. If a sea area is isolated for a sufficient period of time, there will be many fish and organisms. A rebound will occur. Prosperous fish will gradually spread to adjacent waters. Intelligent protected areas can even make marine ecology more resilient under various pressures (such as pollution, warming and acidification). From this text it can be seen that the author intends to appeal:. ['Strengthening the construction of marine protected areas.', 'Vigorously protecting coral reefs.', 'Prohibition of commercial activities in marine protected areas.', 'Avoid overfishing and protect fish.']