Global warming is a pressing environmental issue, and its impact on marine ecosystems is significant. Rising sea temperatures contribute to changes in the distribution patterns of marine organisms. Fish species, for example, are now found further north or south, following more comfortable water temperatures. This not only affects biodiversity, but also the fishing industry, affecting the livelihoods of people who depend on marine resources. Rising temperatures also cause coral bleaching, a phenomenon in which coral loses the symbiotic algae that give it color and nutrients. This bleaching occurs when the water temperature exceeds the coral’s tolerance threshold. In severe circumstances, bleaching can cause coral death, resulting in loss of habitat for many marine species. More than 25% of marine species depend on coral reefs for survival, so this damage could trigger ecosystem collapse. Apart from increasing temperatures, global warming also has an impact on ocean acidity. Increasing concentrations of carbon dioxide (CO2) cause seawater to absorb more CO2, which then interacts with seawater and results in the formation of carbonic acid. This has a negative impact on marine organisms that have shells, such as shellfish and plankton. Their inability to build strong shells can disrupt marine food chains and the growth of populations of larger species. As a result of these environmental changes, we are also seeing an increase in the frequency of extreme weather events such as tropical storms. Rising sea levels, due to melting polar ice caps, create risks for coastal habitats such as mangroves and seagrasses. These coastal ecosystems, which serve as protection against waves and erosion, are becoming increasingly threatened, affecting biodiversity and the quality of life of coastal residents. Moreover, many marine species are adapting rapidly to these changes, all through the process of evolution. However, this adaptability varies by species. Species that have faster generation periods, such as plankton, may be able to adapt more quickly than species that have longer life cycles, such as whales. This process creates an imbalance in the ecosystem and can drastically change the biological structure of the ocean. In an economic context, the impact of global warming on marine ecosystems is also clear. Reduced fishing and habitat destruction can impact incomes for coastal communities and countries that depend on fisheries as a primary source of food. Collective action is needed to reduce greenhouse gas emissions and formalize sustainable fish management to protect increasingly threatened marine resources. Facing this challenge, public education and awareness regarding global warming and its impacts is important to strive for. Research and development of environmentally friendly technology can also help in mitigation and adaptation to changing ocean conditions. Through collaboration between countries and strong policies, there is still hope to save marine ecosystems from the severe impacts of global warming.
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