| http://www.w3.org/ns/prov#value | - United Nations Conference on Sustainable Development United Nations Conference on Sustainable Development Jump to: navigation, search Calendar.png Rio+20 United Nations Conference on Sustainable Development: on 2012/06/20 At the Rio+20 Conference, world leaders, along with thousands of participants from governments, the private sector, NGOs and other groups, will come together to shape how we can
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