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Rio hosts environmental summit with polluted bay

20 June 2012 Last updated at 14:03 BST

Guanabara Bay, one of the iconic sights of Rio de Janeiro, is still blighted by pollution despite the launch of an extensive decontamination programme in 1992 to clean it up.

This week Rio hosts the UN Conference on Sustainable Development, dubbed Rio+20.

Silvia Salek reports.

Video produced by Gerardo Lissardy.