Amanzi abobona bumanzi buxhaphakileyo apha emhlabeni. Ubuninzi bamanzi bungama-71% emhlabeni. Amanzi angangxengwanga nganto akanavumba, akanancasa, engenawo nombala. Amadwala, iilwandle kunye nemilambo zezinwe ngamanzi. Imvula ngamanzi aza avela emafini esibhakabhaka. Ukuba ke amanzi aye abanda kakhulu, (abe kwiqondo elingaphantsi kwe-0), ayaqina abe ngumkhenkce. Imvula engamatye isenokuba ngumkhenkce okanye ibe liliqhwa xa iimeko zivuma. Ukuba ke amanzi aye ashushu kakhulu (mhlawumbi iqondo lobushushu bawo bubengaphezulu kwe-100), avele abile abe ngumophu ke ngoku. Abaluleke kakhulu amanzi ebomini. [2] Nangona kunjalo, kukho uphando oluthi kuya kuthi kubetha umnyaka ka-2025 bangaphezulu kwesiqingatha abantu abayakube benganamanzi ngokwaneleyo apha emhlabeni. [3]