Across from Riocentro, Athletes' Park (one of many infrastructure works Rio is creating for the 2016 Olympics), hosted 41 pavilions in an exhibition open to the public. There were national governments, state governments from Brazil, official United Nations offices, companies, and Brazilian organisms.
I hadn't thought of it at the time, but designer Nathan Waterhouse has a point when saying the setting divided by countries forced assistants in comparison mode and gave a competitive impression, instead of focusing the exhibit on the problems we face as a whole.
Interesting between such spaces was the Rio de Janeiro State structure, covered with pallets.
Read more: Massive Pavilion Covered with 7,000 Pallets at Rio+20 Exhibition