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Climate change has become one of the most pressing global challenges, with profound consequences on the environment, society, and economies. Among the ecosystems most vulnerable to these changes, the ocean ecosystem stands at the forefront. Oceans cover more than 70% of the Earth’s surface and play a critical role in regulating the planet’s climate by absorbing carbon dioxide, storing heat, and supporting vast biodiversity. However, human-induced climate change has disrupted the delicate balance of ocean systems, leading to significant and sometimes irreversible impacts on marine ecosystems and the services they provide to humanity. The impacts are multi-dimensional, affecting physical, chemical, and biological processes, and they manifest in phenomena such as ocean warming, acidification, sea-level rise, altered circulation patterns, and ecosystem degradation. One of the most immediate impacts of climate change on the ocean ecosystem is ocean warming. As greenhouse gases trap heat in the atmosphere, a large share of this excess heat is absorbed by the oceans. Warmer sea surface temperatures affect marine species in several ways, ranging from altering their reproductive cycles to shifting their geographic distribution. For instance, many fish species are migrating poleward in search of cooler waters, which disrupts established food webs and fisheries. Coral reefs, often referred to as the “rainforests of the sea,” are particularly sensitive to temperature changes. Even a small rise in temperature can trigger coral bleaching, a process where corals expel the symbiotic algae living within them, leading to their death if stressful conditions persist. This not only threatens coral biodiversity but also affects millions of people who rely on reefs for food security, tourism, and coastal protection. Another critical impact of climate change on oceans is acidification. Oceans act as a natural sink for atmospheric carbon dioxide, absorbing nearly a third of human emissions. While this helps mitigate the pace of atmospheric warming, it leads to a chemical reaction in seawater that lowers its pH, making it more acidic. Ocean acidification poses a grave threat to organisms that __________ ______ _________ ______ _____ ________.
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