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The stratospheric ozone layer plays a critical role in protecting life on Earth by absorbing the majority of the sun's harmful ultraviolet (UV) radiation. When the ozone layer is depleted, it leads to an increase in UV-B radiation reaching the Earth's surface, which has numerous direct and indirect impacts on environmental health. One of the most immediate consequences is the effect on human health. Increased exposure to UV-B radiation is strongly associated with higher incidences of skin cancers, particularly melanoma and non-melanoma types. It also accelerates skin aging, causes sunburn, and can lead to eye disorders such as cataracts and photokeratitis. For populations with high sun exposure, such as agricultural workers or outdoor laborers, these health risks are particularly pronounced. Furthermore, UV radiation suppresses the human immune system, making individuals more susceptible to infectious diseases and potentially affecting the effectiveness of vaccines. Beyond human health, stratospheric ozone depletion has profound impacts on ecosystems and biodiversity. UV-B radiation can affect the physiological and developmental processes of plants, including growth, photosynthesis, and nutrient cycling. Sensitive crops, such as wheat, rice, and soybean, exhibit reduced productivity under increased UV exposure, which can affect food security and agricultural economies. In aquatic ecosystems, UV-B radiation penetrates the surface of oceans, lakes, and rivers, impacting phytoplankton, the foundation of aquatic food webs. Phytoplankton productivity is critical for global carbon cycling and oxygen production, and its reduction can cascade through the ecosystem, affecting fish populations and other marine organisms, ultimately influencing fisheries and human nutrition. Stratospheric ozone depletion also interacts with climate change. Certain _________ _____ _____ _________ ________ __________ __________ ___ ________ _______ _________.
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