Ans. The depletion of ozone has significant environmental and human health impacts. In the stratosphere, ozone acts as a shield, absorbing the majority of the sun's harmful ultraviolet-B (UV-B) radiation. A reduction in ozone levels allows more UV-B radiation to reach the Earth's surface, leading to increased risks of skin cancer, cataracts, and suppressed immune system function in humans. It also affects marine ecosystems by harming phytoplankton and disrupting the food chain. Additionally, increased UV-B radiation can damage crops, reduce agricultural yields, and impact the overall biodiversity of terrestrial ecosystems.