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Documents > UNEP < Volver
![Keeping track of our changing environment Keeping track of our changing environment](http://rio20.net/wp-content/uploads/2011/11/keeping_track-e1320421819891-160x110.jpg)
November 04 2011
Keeping track of our changing environment
In 1992, the first United Nations Conference on Sustainable
Development, popularly known as the Rio Earth Summit, was ...
By UNEP