Global marine issues cover the various challenges facing oceans around the world. One of the most pressing is climate change, which is causing rising sea temperatures and coral reef bleaching. According to a report from the Intergovernmental Panel on Climate Change (IPCC), sea surface temperatures have increased significantly, affecting marine ecosystems and the life that depends on them. Meanwhile, marine pollution, caused by plastic waste, industrial waste and dangerous chemicals, is a serious problem. It is estimated that every year, eight million tons of plastic enter the ocean. This trash not only pollutes the water, but also impacts marine life such as fish, seabirds and marine mammals, which often get caught in or mistake the trash for food. The extinction of marine species is also a major concern. Many species, especially fish, are threatened by overfishing and environmentally destructive fishing methods. Data from the World Wildlife Fund shows that global fish populations have declined drastically in recent decades. Sustainable fishing is very important to maintain the balance of the marine ecosystem. Before taking protective steps, it is important to understand more deeply about marine ecosystems. This ecosystem functions as a global climate regulator, oxygen provider, and source of livelihood for millions of people. Therefore, protecting marine ecosystems is a strategic step to safeguard the common good. One way to provide protection is by establishing marine protected areas, which help protect important habitats and endangered species. The use of technology can also help monitor the health of marine ecosystems. Drones and underwater sensors can be used to monitor biodiversity and water quality. In addition, education and public awareness programs are very important to increase public understanding of the importance of marine sustainability. Global initiatives such as the United Nations Sustainable Development Goal 14 aim to protect the oceans, maintain sustainable management of marine resources, and increase international collaboration. Cooperation between coastal countries is needed to ensure fair and sustainable use of marine resources. Having strict regulations on fishing activities and reducing pollution are crucial steps in overcoming marine issues. Each individual also has an important role in protecting marine ecosystems. Reducing the use of single-use plastics and participating in beach clean-up programs are some steps that can be taken. With increasing awareness of the importance of ocean sustainability, it is hoped that more parties will invest in green technology and innovative solutions to this problem. Further research into the impacts of climate change and pollution is also needed to get a clearer picture of the complex interactions in marine ecosystems. Overall, global ocean issues and marine ecosystem protection require a collaborative approach involving various sectors, from government to civil society. Environmental sustainability cannot be achieved without collective action and a heightened awareness of the condition of our oceans. Healthy oceans will ensure the survival of all creatures on Earth.