Global warming is an increasingly urgent issue and has a significant impact on marine ecosystems. Rising global temperatures result directly in changes in sea surface temperatures, which impact various aspects of marine life, including biodiversity, migration patterns, and the health of coral reefs. One of the most striking impacts of global warming is ocean acidification. When carbon dioxide (CO2) from the atmosphere dissolves in seawater, it produces carboxylic acids which increase acidity. Changing the pH of seawater can damage shell-building organisms such as molluscs and coral. Coral reefs, as important habitats for thousands of fish species, are highly vulnerable to acidification. The decline in coral reef populations can lead to the loss of marine biodiversity. In addition to acidification, changes in ocean temperatures are also changing species distributions. Many fish, such as tuna and sardines, migrate to cooler waters in search of suitable temperatures. This movement can disrupt local ecosystems and affect the global fishing industry. Areas previously rich in fish resources may lose fish stocks, while new areas may experience overpressure due to increased demand. Global warming can also cause an increase in the frequency and intensity of marine storms. This condition has the potential to damage important habitats such as mangroves and seagrass beds. Mangroves function as a buffer that protects beaches from erosion and as a breeding ground for many species of fish. When weather patterns change, these ecosystems experience damage, resulting in a decrease in habitat quality. Changes in temperature and ocean currents also affect the life cycles of marine organisms. Many species have reproductive cycles that depend on specific temperatures or times of year. When ocean temperatures change, spawning times can be disrupted, disrupting the survival of certain species. Healthy marine ecosystems are essential to human life, providing food, tourism and protection for the environment. However, with the continuing impacts of global warming, there will be major consequences for these ecosystems. A decline in biodiversity can affect the health of entire ecosystems, ultimately threatening food security and the economic well-being of coastal communities. Investment in research and the use of environmentally friendly technologies is essential to overcome these challenges. Reducing greenhouse gas emissions and protecting marine habitats are crucial steps to ensure the sustainability of marine ecosystems. With collective awareness and action, perhaps we can prevent further damage to marine ecosystems in the future, while maintaining the balance of ecosystems that are vital for life on Earth.