Climate change has a significant impact on marine ecosystems, causing disturbing impacts on biodiversity and ecosystem balance. As global temperatures increase, sea surface temperatures also increase. This has resulted in coral bleaching in many locations, which are important habitats for various marine species. Bleached coral loses zooxanthellae, the symbiotic algae that provide color and nutrients, resulting in the death of coral colonies if conditions do not improve over a long period of time. In addition, increasing sea surface temperatures cause changes in the migration patterns of fish species. Many species are seeking cooler waters, potentially affecting fisheries and economies that depend on fish resources. These changes also disrupt food chains, resulting in population declines of certain species and increased competition among other species. Rising temperatures are also associated with increased frequency and intensity of tropical storms. These storms can damage coastal habitats such as mangroves and coral reefs, which serve as protection for coastal communities. Damage to coastal ecosystems results in the loss of shelter and spawning areas for many marine creatures. Ocean acidification is another consequence of climate change that cannot be ignored. Rising CO2 levels in the atmosphere cause more of this gas to dissolve in the ocean, producing carbonic acid. The impact is felt on marine organisms that have shells or calcium carbonate structures, such as mollusks and coral reefs. In more acidic conditions, the growth and development of these organisms is disrupted, potentially changing the composition of the marine community as a whole. Extreme weather changes such as El Niño are also becoming more frequent due to climate change. This phenomenon affects ocean temperature and salinity, which can cause further damage to the ecosystem. For example, during El Niño events, sea surface temperatures in the Pacific rise, affecting fisheries worldwide, especially in coastal countries. Shrinking polar ice sheets contribute to sea level rise, which threatens coastal habitats. Mangrove and seagrass ecosystems, which are important habitats for many fish and invertebrate species, are increasingly threatened by saltwater intrusion produced by rising sea levels. Genetic diversity is also at risk of being threatened. With the movement of species to new areas, unprecedented interactions between different species occur. This can increase the risk of spreading diseases and parasites, which can disrupt the balance of the ecosystem. Innovation and mitigation policies are needed to face this threat. Further research into the specific impacts of climate change on marine ecosystems is essential to develop effective adaptation strategies. The global community needs to collaborate in preserving marine ecosystems which are crucial for the survival of this planet.