Amanzi awumthombo wokuphila, asikwazi ukuphila ngaphandle kwamanzi, noma kunjalo, ngenxa yokuthuthukiswa kwabantu nokungcoliswa kwemithombo yamanzi, izindawo eziningi zibhekene nokuntuleka kwamanzi okukhulu kanye nokwehla kwezinga lamanzi.Ukuze kuxazululwe lezi zinkinga, ososayensi nonjiniyela abaningi banikela ngazo...
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