Oxygen threshold for dead zones needs revision
ABOUT 246,000 square km of oceans
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/sans-o2
[2] http://admin.indiaenvironmentportal.org.in/category/author/sumana-narayanan
[3] http://admin.indiaenvironmentportal.org.in/category/newspaper/down-earth
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/marine-pollution
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/marine-research
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/oceans-and-seas
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/science-and-technology
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/spain