According to the researches in Bang Tao bay destructions,
it illustrates the main reason is generally from human
activities such as trash thrown into the sea and
it has been found that all of those things get stuck
in the reef. The actual amount of trash, specifically plastic,
that escapes our landfills and enters the ocean each year
was only recently calculated. The special researcher
estimated in January 2015 that around 4.8 to 6.0 million
tones of rubbish were found in Andaman Ocean and
more than 40 percents of those were plastic trash.
Unfortunately, this could cause the extinction of Coral reef
and it underwater is getting closer to the end.