The impact of global climate change on marine ecosystems is very broad and complex. One of the most striking aspects is the increase in sea temperatures. According to research, sea surface temperatures have increased by more than 1 degree Celsius since pre-industrial times. This increase in temperature causes coral to undergo a bleaching process, which can damage habitats and threaten the existence of marine species that depend on them. In addition, climate change is driving ocean acidity levels to increase. Increased concentrations of carbon dioxide (CO2) in the atmosphere cause CO2 to dissolve in seawater, changing the pH of the water. This condition has a negative impact on organisms that have hard shells, such as shellfish and several species of plankton, which are an important part of the marine food chain. Changes in ocean current patterns are also a serious impact of climate change. Ocean currents play an important role in distributing heat across the planet and influencing regional climates. These changes could destroy established ecosystems, disrupt fish migration, and impact marine-based tourism, such as snorkeling and diving. In addition, climate change is resulting in an increase in the frequency and intensity of marine storms, including tropical storms. These storms damage coastal habitats, such as coral reefs and mangroves, which serve as refuge for many species. This damage shows how marine ecosystems interact with land ecosystems and vice versa. Apart from physical impacts, climate change affects the distribution of marine species. Some fish species, such as tuna, have started to move to cooler waters, leaving the coastal areas they usually inhabit. This changes ecosystem interactions and can lead to a decline in their populations, impacting the ecosystem as a whole as well as economies that depend on the fish. These changes also have the potential to increase the problem of invasive species. Non-native organisms can spread to new areas due to changes in environmental conditions. They can compete with local species and disrupt the balance of ecosystems, potentially endangering the livelihoods of communities that depend on marine resources. Finally, the impact of climate change on marine ecosystems cannot be separated from resource management issues. Changing environmental conditions can complicate conservation efforts, where currently used strategies may no longer be effective. Continuous research and monitoring is needed to support good decision making in marine ecosystem management. With all these changes, it is important for stakeholders, including governments, non-governmental organizations, and society, to understand the impacts of climate change on marine ecosystems. Only with good collaboration and knowledge can effective adaptation and mitigation measures be developed to maintain the sustainability of marine ecosystems for future generations.