The impact of global climate change on marine ecosystems is very significant and has far-reaching implications. One of the most striking impacts is an increase in sea surface temperatures. Higher temperatures accelerate the global warming process and have a direct impact on marine life. Korhal, for example, is very sensitive to changes in temperature. Excessive warming causes coral bleaching, where the symbiotic algae that give coral their color lose contact, resulting in mass death on coral reefs. In addition, rising ocean temperatures are driving species movements. Many fish and other marine animals seek cooler waters, which can change ecosystems and community structure. For example, previously dominant species may be crowded out by non-native species, leading to resource imbalances and competition. This, in turn, affects the fishing industry which relies on certain species. The climate change phenomenon also causes an increase in carbon dioxide (CO₂) levels in the atmosphere, which is absorbed by the ocean. This process results in ocean acidification, causing a decrease in seawater pH. Ocean acidification impacts organisms with shells as well as corals that have difficulty building their skeletal structures. This impacts the entire food chain, as many species depend on these organisms as a food source. Changes in weather patterns due to climate change also have an impact on marine ecosystems. More frequent and stronger storms could damage coastal habitats, including mangroves and seagrass. This damage not only affects the existence of aquatic entertainment, but also the protection against erosion and natural disasters for coastal communities. Climate transitions also affect the distribution of nutrients in the ocean. As temperature increases, stratification of surface layers of water increases, reducing the mixing that is important for nutrient distribution. This reduces primary productivity, resulting in a reduction in the phytoplankton population that underlies the marine food chain. The global warming process also drives the fastest phenomenon, namely melting of polar ice, which contributes to sea level rise. The habitats of polar species, such as penguins and polar bears, are threatened with extinction as they lose their hunting grounds and nesting sites. This balance in ecosystems can have much broader impacts on global biological systems. The socio-economic impacts of climate change on marine ecosystems are also significant. Coastal communities that depend on fishing and tourism will feel the direct impact. Loss of income and loss of access to natural resources can lead to migration, economic instability and conflict. Difficulty in meeting food needs from the sea is a major concern for global food security. Therefore, it is important to understand and address the impacts of climate change. Developing mitigation and adaptation strategies can help protect vital marine ecosystems. Sustainable management of resources, habitat restoration and reduction of CO₂ emissions are crucial steps to ensure the future survival of marine ecosystems.