Isishwankathelo Ukwanda kwemizi-mveliso kunye nabemi kwiminyaka embalwa edlulileyo kube negalelo elikhulu ekonakaleni komgangatho wamanzi. Ezinye zeegesi ezivela kwizityalo zonyango lwamanzi ziyingozi kwaye ziyatsha, ekufuneka zichongwe, ezifana ne-hydrogen sulfide, i-carbon dioxide, i-methane, kunye ne-ca...
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