Global climate change is having a significant impact on marine ecosystems around the world. Various aspects such as increasing sea temperatures, acidification of sea water, and changes in ocean current patterns change the structure and function of this ecosystem. One of the most direct impacts is an increase in sea water temperatures. Higher temperatures can cause coral bleaching, a phenomenon in which the symbiotic algae that gives coral their color is lost. This results in coral death and threatens the biodiversity that depends on it. Coral reefs, known as “marine rainforests,” provide habitat for various species of fish and other marine organisms. In addition, acidification of seawater caused by the absorption of carbon dioxide (CO2) increases, impacting organisms that depend on calcium carbonate to build shells or skeletons. Mollusks, crustaceans, and corals are examples of affected species. Research shows that increasing seawater acidity can reduce the ability of these organisms to grow and develop, potentially disrupting marine food chains. Changes in ocean current patterns also have an impact on the ecosystem. Changing ocean currents can affect nutrient distribution and temperature, affecting the migration of fish and other marine animals. Predator and prey species can throw off population balance, affecting fishing industries around the world. The number of catches could decrease drastically, negatively impacting the economies of coastal communities that depend on fisheries. Rising sea levels, due to melting polar ice and thermal expansion of water, also result in the loss of coastal habitats such as mangroves, estuaries and seagrass beds. These habitats serve as breeding grounds for many fish species and are important buffers against storms and erosion. When these habitats are lost, the species that depend on them are threatened with extinction. Global climate change is also triggering an increase in the frequency and intensity of tropical storms. These storms can destroy coral reefs and carry pollutants and waste into marine ecosystems, destroying the balance of these ecosystems. Pollution from land can impact the quality of biodiversity, disrupting natural food chains. In a socio-eco context, impacts on marine ecosystems also influence human life. Coastal communities that depend on marine resources for food and livelihoods are facing a crisis. Declining water quality and biodiversity can increase resource conflicts between competing communities. Adaptation and mitigation to climate change are crucial for protecting marine ecosystems. Protection of marine areas, sustainable fisheries management, and efforts to reduce carbon emissions are important steps that need to be implemented. An integrated ecosystem approach can help ensure that marine ecosystems remain healthy and able to support human life and well-being, even amidst the growing challenges of climate change.