171693
The need for an islands specific conference was highlighted some two years prior at the 1992 United Nations Conference on Environment and Development ( Earth Summit ) , held in Rio de Janeiro where 179 governments voted to adopt Agenda 21 .
 Rio de Janeiro, Agenda 21
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Rio de Janeiro, Agenda 21