The UNEP had in its 2011 report presented to the Federal Government, recommended that at least $1 billion would be required in the first five years, which is expected to be completed in three decad
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/federal-government-votes-190-million-ogoni-clean
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/guardian-nigeria
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/environment
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/oil-pollution
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/nigeria
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/water-pollution
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/ecology
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/africa