I attended a workshop on mapping tools hosted by Google in Sydney as part of the World Parks Congress this week.
They introduced me to Google Earth Engine, which hosts more than 3.6 million images from 40 years of Landsat data (which can be downloaded for free). I found it a useful tool for observing coastal change in different areas of the world.
In the spirit of the World Parks Congress, here is a time lapse showing yearly Landsat satellite images from 1984 to 2012 of the Belize coastline. The Belize Barrier Reef system was put on the list of World Heritage in Danger in 2009 due to excessive mangrove removal associated with coastal development.