In the year 2012 the United Nations met again in Rio de Janeiro in mapping progress in sustainable development at the United Nations Conference on sustainable development (Rio + 20 Conference known)
In 2012, the United Nations, met again in Rio de Janeiro in mapping progress on sustainable development at the United Nations Conference on Sustainable Development. (Known as the Rio + 20).
In 2012 nations met again in Rio de Janeiro in mapping progress in sustainable development United Nations Conference on sustainable development. (also known Rio meeting 20).