There are many ways that pollution can damage reefs. Debris like this plastic bag can quickly become entangled on a coral and smother it.
An estimated one million people whale watch within Stellwagen Bank National Marine Sanctuary in Massachusetts every year during the peak months of April to October.
NOAA's National Ocean Service
N/MB6, SSMC4, Room 9149
1305 East-West Hwy
Silver Spring, MD 20910
Revised: June 22, 2015 | You are here: http://oceanservice.noaa.gov/education/tutorial_corals/media/supp_coral09b.html