Coral bleaching!

Coral bleaching is when they lose their zooxanthellae because of loss in pigmentation. It is dependent on a symbiotic relationship so if anything changes in their lives the zooxanthellae leaves the Coral. For instance earth's temperature rising. If the Coral can no longer supply the zooxanthellae with the necessary nutrients to perform photosynthesis the zooxanthellae will abandon the Coral causing its conditions to only worsen. Eventually leading to death. If the coral begins to die off it can no longer remain a habitat for the marine life that were living and eating off the algae on it. Coral Reef bleaching is an important topic because according to Brian Skoloff of The Christian Science Monitor, "If the reefs vanished, experts say, hunger, poverty and political instability could ensue."