This Status of Coral Reefs of the World: 2008 report from the Global Coral Reef Monitoring Network summarises what has happened to the world
Links:
[1] http://admin.indiaenvironmentportal.org.in/reports-documents/status-coral-reefs-world-2008
[2] http://admin.indiaenvironmentportal.org.in/category/author/clive-wilkinson
[3] http://admin.indiaenvironmentportal.org.in/category/publisher/global-coral-reef-monitoring-network
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/indian-ocean
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/corals
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/climate-change
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/biodiversity-conservation
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/india
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/global
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/south-asia