​How has Agenda 21 helped in Sustainable Development ?

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Please refer the links for a similar query answered by expert:

https://www.meritnation.com/ask-answer/question/what-were-the-aims-of-agenda-21-to-achieve-global-sustainabl/resources-and-development/11254375

https://www.meritnation.com/ask-answer/question/what-were-the-content-of-agenda-21-adopted-at-earth-summit-a/resources-and-development/7429305