Ingabe izikhwama zepulasitiki nezitsha ziyingozi emvelweni?
Ngamafuphi, yebo.  Nokho, ngokumangazayo, lokho akukaze kuvunyelwane ngaso sonke isikhathi, futhi kwezinye izimo, akulona iqiniso.  Phakathi nenkinga yamandla ka-1970, ukunciphisa isisindo sezinto, nokwandisa isikhathi sokugcina izimpahla (okusiza ekuthuthukiseni izindlela zokuthutha) kwahlonishwa kabanzi njengokuhle emvelweni. Ngamafuphi, izikhwama zamaphepha zinesisindo esikhulu kunezikhwama zepulasitiki, futhi ukuthuthwa kwazo kudinga izinto zokubasa ezimbiwa phansi, futhi ngokuqinisekile izinto zokubasa ezimbiwa phansi zithinta imvelo ngezindlela ezibhalwe phansi.  Futhi, amanye amapulasitiki anjenge-PET anerekhodi elihle lokuvuselelwa kabusha. Ngakho uma kunciphisa ukusetshenziswa kwamandla, kwandisa isikhathi sokusebenza, futhi kungenziwa kusetshenziswe kabusha kubonakala kuwukunqoba okukhulu kwemvelo.  Nokho, amapulasitiki ahlala isikhathi eside, futhi manje amapulasitiki amancane atholakala yonke indawo. Zisemihumeni ejulile yolwandle, ziqongelelwe ezinhlotsheni eziningi zezilwane nezitshalo, futhi ziyoba khona phakathi nesikhathi sokuphila kwethu. Ubuthi nemiphumela yabo emibi kusanda kuqala ukuqondwa. Lokhu kuye kwaholela ekususweni kwamapulasitiki asetshenziswa kanye" kwezentengiselwano eziningi, futhi amaqembu ezemvelo emhlabeni wonke afuna ukuba kuncishiswe ukusetshenziswa kwawo".