Reef ProjectDespite covering less than 1% of the ocean floor, coral reefs are estimated to be home to about 25% of all marine species. Unfortunately, these vibrant underwater cities are dying. Climate change and its effect of rising sea temperatures is devastating the colorful algae that give coral reefs their brilliant hues, resulting in coral bleaching. Furthermore, other threats like pollutionin its various insidious formsand overfishing are disrupting the