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The greatest action any human can take to reduce emissions / waste is to have no , or fewer , children . Yet environmental organizations , governments , and activists do n't even mention it . # overpopulation {@The Nature Conservancy@} {@Greta Thunberg@} {@The Guardian@} {@CNN@} {@MSNBC@} {@WWF@} {@NPR@} {@BBC News (World)@} {@United Nations@}
 The Nature Conservancy, Greta Thunberg, The Guardian, CNN, MSNBC, WWF, NPR, BBC News (World), United Nations
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: group, creative work, person, event, product, location, corporation 
Text: {0} 
Answer:
 The Nature Conservancy, Greta Thunberg, The Guardian, CNN, MSNBC, WWF, NPR, BBC News (World), United Nations