Ulawulo lwa Manzi

© Roger de la Harpe
Amashumi asixhenxe (70%) omhlaba, ugqunywe ngamanzi. Amashumi alithoba nesixhenxe (97%) yawo onke amanzi, ngamanzi anetyuwa.
Ngaphantsi kwesithathu sepesenti (3%) yamanzi amatsha acocekileyo, kuphela ngumlinganiselo we 0.3% ngamanzi angaphezulu afikeleleka lula kuthi ukuze siwasele okanye siwasebenzise kwimveliso yokutya nako konke esikuvelisayo ukuze siphile. Okuseleyo:
69% - Akhenkcezisiweyo
0.7% - Ase moyeni
30% - Ngaphantsi
Amanzi anqabile. Amanzi awayekhona apha emhlabeni kwizigidi zeminyaka ngaphambili asekhona nangoku kwaye awazokwanda. Okufuneka kutshintshe yindlela esiwasebenzisa ngayo ukuze sihlale siphila. Kufuneka sifunde ukuba singadlali ngawo. Kumanzi amatsha acocekileyo esiwasebenzisayo:
70% isetyenziselwa ezolimo
20% isetyenziselwa imizi mveliso kunye
10% namakhaya nokusela nokupheka
Ukuze sivelise amanzi kufuneka sihlale sizama okutsha ukufumana iindlela zokusebenzisa amanzi amancinci kwaye singadlali ngamanzi kwimveliso yokutya kwethu.
Ukuvelisa ikilogram yenyama yenkomo kuthatha 15 000 yelitha zamanzi okanye 15 m³ zamanzi
Ukuvelisa ikilogram yenkozo ze rayisi kuthatha 3 500 yelitha okanye 3.5 m³ zamanzi.
Sinethamsanqa ke kuba kwezolimo zale mihla, ukuzama indlela ezithile zokwenza izinto kusizisele indlela yokuqwalasela umlinganiselo wamanzi emhlabeni. Oku kwenza kubelula ukunkcenkceshela ngendlela zokunkcenkceshela ezintsha kwaye ezilula ezingenzi ilahleko yamani ezifana ne driphu yangaphezulu neyanga phantsi emhlabeni. Kodwa ke kusenjalo, ngapha kwama 60% wamanzi asetyenziselwa ukunkcenkceshelwa kwezolimo kudlalwa ngawo kwizinto ezingabhadlanga. Ngokuthi kuhlolwe ngempumelelo amanzi ashiyekileyo kwingcambu zezityalo ezohlukileyo, izakunceda ukuthintela ilahleko.

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