Threats to Coral Reefs - Human vs Natural Causes?

There are many threats to coral health, both natural and anthropogenic. But it is thought that human activity poses a much greater threat than natural causes. Factors such as fishing, sedimentation and pollution all have an impact on coral health. However here I will look in detail at coral bleaching, perhaps the biggest threat to coral health, a process generally regarded as being influenced by human behaviour. I will also discuss in less detail the other main human threats to corals.