One the most troubling problems is that of coral bleaching. When this happens, the coral loses its primary food source and basically dies of starvation and turns white. There are man-made dangers to the Great Barrier Reef as well. Damage can be done to coral through pollution from sewage, oil spills, and fertilizers. When boats run aground or drop heavy anchors on reefs, the protective coral skeletons are broken, exposing polyps to damage or death.
Explosive mining is another destructive force.
The Great Barrier Reef is home to an astounding variety of marine life. From it, we can gain a greater understanding and appreciation for the marine ecology and for the delicate balance that maintains it.