Editing Eutrophication (section)

== Extent of the problem ==
Surveys showed that 54% of lakes in [[Asia]] are eutrophic; in [[Europe]], 53%; in [[North America]], 48%; in [[South America]], 41%; and in [[Africa]], 28%.<ref name="ILEC">ILEC/Lake Biwa Research Institute [Eds]. 1988–1993 Survey of the State of the World's Lakes. Volumes I-IV. International Lake Environment Committee, Otsu and United Nations Environment Programme, Nairobi.</ref> In South Africa, a study by the CSIR using [[remote sensing]] has shown more than 60% of the reservoirs surveyed were eutrophic.<ref>{{cite journal|last1=Matthews|first1=Mark|last2=Bernard|first2=Stewart|year=2015|title=Eutrophication and cyanobacteria in South Africa's standing water bodies: A view from space|journal=South African Journal of Science|volume=111|issue=5/6|pages=1–8 |doi=10.17159/sajs.2015/20140193|doi-access=free}}</ref>

The [[World Resources Institute]] has identified 375 [[Hypoxia (environmental)|hypoxic]] coastal zones in the world, concentrated in coastal areas in Western Europe, the Eastern and Southern coasts of the US, and [[East Asia]], particularly [[Japan]].<ref>
Selman, Mindy (2007) ''Eutrophication: An Overview of Status, Trends, Policies, and Strategies.'' World Resources Institute.</ref>