Global climate change has a significant impact on marine life, which is reflected in various aspects of marine ecosystems and fisheries resources. Rising sea temperatures due to global warming have a chain impact on marine organisms, including coral reefs, fish and marine mammals. One of the most striking effects is the bleaching of coral reefs. Corals, which are very sensitive to temperature, will expel zooxanthellae, symbiotic algae that provide color and nutrients. This bleaching results in decreased biodiversity and disrupts the habitat for many species. Globally, around 30% of coral reefs are threatened with extinction, which is very detrimental to coastal ecosystems. Rising temperatures not only affect coral reefs, but also affect fish distribution. Many fish species, such as tuna and sardines, will move away from the tropics and into cooler waters. This movement impacts the local fishing industry, which relies on certain species. With shifts in fish migration, fishermen may lose their livelihoods, and food security in the region is threatened. Ocean acidification is also a result of increasing carbon dioxide levels in the atmosphere. When carbon dioxide dissolves in seawater, the ocean’s pH decreases, which affects the ability of organisms such as shellfish, molluscs and plankton to build their shells. The decline in the population of these basic organisms will have a direct impact on the marine food web. Furthermore, climate change is contributing to an increase in the frequency and intensity of marine storms, resulting in the destruction of coastal habitats. Mangroves and seagrass beds which function as protection against coastal erosion are decreasing, thereby increasing the vulnerability of coastal ecosystems. Additionally, water pollution and nutrient runoff, such as nitrogen from agriculture, can worsen these conditions, causing eutrophication that blocks sunlight and kills organisms on the seabed. Biodiversity loss also occurs in the form of invasive species that emerge due to changes in temperature. Species like the lionfish disrupt the balance of the ecosystem, endangering local species that have no mechanisms to deal with the threat. This creates competition for resources and can lead to the extinction of local species. Ecosystem shifts also have significant socio-economic impacts. Coastal communities that depend on sea-based tourism and fisheries will suffer losses. Limited assets resulting from maritime affairs can lead to migration and social shifts, creating new problems in resource management and economic resilience. Overall, the impact of global climate change on marine life is a complex issue that requires serious attention. Further research and ongoing monitoring are needed to understand these changes and develop effective mitigation strategies, so that we can maintain the sustainability of marine ecosystems and ensure environmental health for future generations.