Izinzwa zoxinzelelo zizinto ezibalulekileyo kumashishini ahlukeneyo, kubandakanywa ukongiwa kwamanzi, ukuthutha, ulwakhiwo olukrelekrele, ulawulo lwemveliso, iikhemikhali zepetroli, imithombo yeoli, ukuveliswa kwamandla kunye nemibhobho. Ezi zivamvo zilinganisa...
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