What is the negative tourism in boracay island?

With tourism development, changes are evident in Boracay Island in terms of sand erosion, coastal pollution,
and environmental changes such as the sporadic felling of timber. A wastewater treatment facility was built with
a joint venture with Japan, and this facility is to keep pace with waste disposed from various tourism operations.
However, wastewater is not properly treated and evidence of sulfide spills over to the shorelines. This has
resulted in the sand having a strange smell and implications for the future remain negative.