Water pollution causes serious risks to people's health. However, as the pollution of Minamata Bay in Japan showed, it can be the pollutants that cannot be seen which cause most harm.
Stephen Codrington
CC BY 2.5
Figure 3.20 Planet Geography 3rd Edition (2005) <a rel="nofollow" class="external autonumber" href="http://www.planetgeography7.com/PG7/Old_Editions.html">[1]</a>