Environmental issues with coral reefs

Human activities have substantial impact on coral reefs, contributing to their worldwide decline. Damaging activities encompass coral mining, pollution (both organic and non-organic), overfishing, blast fishing, as well as the excavation of canals and access points to islands and bays. Additional threats comprise disease, destructive fishing practices, and the warming of oceans. Furthermore, the ocean's function as a carbon dioxide sink, alterations in the atmosphere, ultraviolet light, ocean acidification, viral infections, the repercussions of dust storms transporting agents to distant reefs, pollutants, and algal blooms represent some of the factors exerting influence on coral reefs. Importantly, the jeopardy faced by coral reefs extends far beyond coastal regions. The ramifications of climate change, notably global warming, induce an elevation in ocean temperatures that triggers coral bleaching—a potentially lethal phenomenon for coral ecosystems.

Scientists estimate that between 2020 and 2040, about 70 to 90% of all coral reefs will disappear, with primary causes being warming ocean waters, ocean acidity, and pollution. Others believe that the mass mortality events over this time frame will give way to the expansion of thermally tolerant mutant populations, but at the cost of coral genetic diversity. In 2008, a worldwide study estimated that 19% of the existing area of coral reefs had already been lost. Less than 20% of the world's reefs could be currently regarded as in good health and about 75% of the world's reefs may be at risk due to destructive, human-related activities.