Climate change affects many aspects of life on Earth, and its impact on marine ecosystems is very significant. Rising global temperatures, the result of greenhouse gas emissions, contribute to warming ocean waters which has serious implications, such as coral reef bleaching. When the water temperature exceeds the coral’s tolerance threshold, the symbiosis between the coral and the zooxanthellae algae is disrupted, causing the coral to lose its color and source of nutrition. This has the potential to endanger marine ecosystems that depend on coral reefs as a place to live. In addition to warming, increasing carbon dioxide (CO2) levels also cause ocean acidification. Seawater absorbs CO2 from the atmosphere, creating carbonic acid which reduces the ocean’s pH. This has a negative impact on marine organisms, especially those with shells, such as shellfish, molluscs and several species of plankton. Acidification can disrupt their shell formation process, causing population declines that impact the marine food chain. Sanitation and habitat structure in marine ecosystems also face threats from climate change. Rising sea levels due to melting polar ice and warming water temperatures increase the risk of flooding in coastal areas. Therefore, important habitats such as mangroves and seagrass are threatened with extinction, resulting in loss of protection for many species and increased coastal erosion. Changing weather patterns, including increased frequency and intensity of tropical storms, are also impacting marine life. Hurricanes can destroy coral reefs and other coastal ecosystems, taking years to recover. Additionally, pollution from floods can flow into the sea, worsening conditions in already stressed ecosystems. The impact of climate change even extends to the economic sector. The fishing industry, which relies heavily on marine biodiversity, is vulnerable to changes in fish populations and marine resources. Many fish species that are the target of catching are experiencing a decline due to changes in temperature and habitat, thereby affecting the income and food security of communities that depend on fishing activities. In the face of these challenges, collective action and science-based solutions are key to protecting marine ecosystems. Conserving coral reefs, strengthening coastal area protection, and reducing carbon emissions are important steps to reduce the impact of climate change. The global community needs to collaborate to build awareness and increase conservation initiatives that focus on the sustainability of marine ecosystems in the face of continuing climate change.
