Global Reefs Map
The World's Resources Institute has produced a Google Map to highlight coral reefs around the world that are currently under threat.
The coral reefs are classified by estimated present threat from local human activities, according to the Reefs at Risk Revisited local threat index. The index classifies the threat by looking at overfishing and destructive fishing, coastal development, watershed-based pollution, and marine-based pollution and damage.
A KML of the data is also available to view in Google Earth.