The impact of global warming on marine life is a major concern among scientists and environmentalists. As sea surface temperatures rise, many marine ecosystems are experiencing dramatic changes. Higher temperatures not only affect fish species, but also affect the entire marine food chain. One of the most significant impacts is coral reef bleaching. Coral reefs are important habitats for many marine species, but higher temperatures cause stress on corals leading to the expulsion of symbiotic algae. Without this algae, coral reefs lose their color and food source. This results in a decline in fish populations that depend on reefs for spawning and hiding places. Furthermore, global warming increases ocean acidity levels, resulting from the absorption of carbon dioxide. These changes disrupt the ability of marine organisms such as molluscs, crustaceans and some types of plankton to form shells and skeletal structures. The decline in populations of these organisms has direct implications for the wider ecosystem, including the fish that prey on them. Rising sea levels due to melting polar ice caps and seawater expansion are also disrupting coastal habitats. Mangrove and estuarine ecosystems have been particularly hard hit, reducing their ability to support marine biodiversity. Additionally, changes in water salinity can affect the migration patterns of various species, disrupting their life cycles. As a result, fish behavior patterns change. Some species have been forced to migrate to colder locations, as they search for optimal temperatures for survival. This movement can disrupt the fishing industry, affect catches, and change existing fish communities. Climate change is also contributing to an increase in the frequency and intensity of hurricanes. The impact of stronger storms damages marine habitats such as coral reefs and seagrass beds that serve as protection for beaches. This loss of habitat leads to a reduction in biodiversity and affects the lives of humans who depend on marine resources. The food chain system is also disrupted by the emergence of invasive species that are better able to adapt to changes in temperature and salinity. These species often compete with existing local species, posing a risk to their survival. Given the importance of each species in the ecosystem, this could result in the collapse of the entire system. Adaptation and mitigation to the impacts of global warming are very important. Efforts to reduce greenhouse gas emissions, protect marine habitats, and regulate sustainable fisheries are urgently needed. With global collaboration, real action can be taken to protect marine biodiversity, which is important for the survival of life on earth. In conclusion, the changes occurring in the oceans as a result of global warming require serious attention. Collective efforts between countries, scientists and society need to be made to reduce these impacts so that marine life can survive and adapt to ongoing changes.