tokens: 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@}