Well if that doesn't get one wondering look at this http://www.worldwatch.org/node/5960 some interesting reading and a cause for concern for us all..
Quoted from the above link..
The latest global coral reef assessment estimates that 19 percent of the world's coral reefs are dead. Their major threats include warming sea-surface temperatures and expanding seawater acidification.
The report, released by the Global Coral Reef Monitoring Network Wednesday at the international climate change negotiations in Poznań, Poland, predicts that many of the remaining reefs may disappear within the next 40 years if current emission trends continue.