Global warming has a significant impact on marine life, which is one of the most important ecosystems on the planet. One of the most striking impacts is the increase in sea water temperature. Higher ocean temperatures contribute to coral bleaching, a phenomenon in which coral expels symbiotic algae that makes it brightly colored. This bleaching causes stress and mass death of coral colonies, which play an important role as habitat for various fish species. Rising temperatures also affect the migration patterns of various fish species. Many species are moving to colder areas to escape extreme temperatures, changing ecosystem dynamics. This can lead to conflicts in fishing, affecting local economies that depend on marine resources. Irregular fishing can threaten the survival of species and disrupt marine food chains. In addition, global warming causes increased ocean acidification due to increased CO2 levels. This process damages the ability of marine organisms such as molluscs and corals to form shells and skeletal structures, which are vital for their survival. Declines in mollusk populations can disrupt broader ecosystems, affecting predators that depend on them as a food source as well as bioenergy balance. Another impact is an increase in the frequency and intensity of sea storms. This extreme weather not only threatens the life of marine biota but also the infrastructure that depends on the marine ecosystem. Damage to coastal habitats, such as mangroves and seagrasses, can reduce their natural protection against climate extremes, thereby worsening conditions for marine life. Changes in ocean currents are also an important issue due to global warming. Changing ocean currents can divert current-borne nutrients, affecting biological productivity in different ocean zones. This has a major impact on species that depend on stable water circulation for food and reproduction, potentially disrupting entire ecosystems. The reduction in polar ice cover due to global warming also has direct implications for marine life. Species that depend on ice as habitat, such as whales and polar bears, face enormous challenges to survive. Ice loss also affects subsurface ecosystems, potentially disrupting food chains across polar regions. Meanwhile, increasing plastic pollution in the sea is increasingly exacerbating problems related to global warming. Various rubbish and microplastics carried by currents can threaten marine life, which often becomes unfit for consumption by marine animals. As the human population increases, these challenges will only increase. The impact of global warming on marine life cannot be underestimated. The complex interactions between these factors mean that changes occurring in the oceans can have far-reaching implications for entire ecosystems and human well-being. Handling a holistic approach that includes climate change mitigation, habitat protection and sustainable management of marine resources is very necessary to protect the future of our marine ecosystem.