Twenty years on from the original 1992 United Nations Earth Summit, Rio was bustling with an additional 40,000 to 50,000 people attending either the official UN Rio+20 summit.
Source: The Conversation
English

Twenty years on from the original 1992 United Nations Earth Summit, Rio was bustling with an additional 40,000 to 50,000 people attending either the official UN Rio+20 summit.
Source: The Conversation
Links:
[1] http://www.idf.org/rio20-and-chronic-diseases-glass-half-empty-or-half-full
[2] http://theconversation.edu.au/rio-20-and-chronic-diseases-a-glass-half-empty-or-half-full-7481