Climate change significantly impacts marine biodiversity by altering ocean temperatures, affecting species distribution, and disrupting ecosystem dynamics. Rising temperatures lead to coral bleaching, loss of habitats, and shifts in marine food webs. Additionally, changes in ocean acidity due to increased carbon dioxide levels threaten calcifying organisms, such as shellfish and corals. Overfishing further compounds these effects, leading to decreased populations of certain species and disrupting the balance of marine ecosystems. Overall, climate change poses a serious threat to the resilience and sustainability of marine life.