nhiu vng khan him ngun nc, cng ngh v sc cha nc ma, hay cn c ngha l vic lu tr ngun nc ma, ang c pht trin v ci tin. Nhng vng ang xy dng ch cha ngun nc ma bao gm c, n v vng ty nam Hoa K.Ci thin hiu sut h thng thy li l mt cch khc lm gim nn khan him nc. Hiu sut s dng nc khc nhau trn ton th gii minh chng cho vai tr tim nng m cng ngh nm gi trong vic lm gim i ni cng thng v khan him ngun nc. Ti Cali, sn xut 1,3 k bt m cn c 1 tn nc; Pakistan cng vi lng nc nh vy ch cho ra t hn mt na. Php sn xut lng bt ng gp i Trung Quc d cng lng nc ging nhau. Lng go Trung Quc sn xut gp i n cng cng lng nc nh nhau.Cng ngh ti tiu ang c tp trung vo vic tng t l cy trng trn tng git nc. Mc ch ca cng ngh ny l phn b nc trc tip n vng t trng. Tuy nhin, cng ngh ny hin ang giai on pht trin, v trn ton th gii ch 1% vng t ti tiu c p dng. Trong 90% nhng vng t ny th li nm nhng quc gia giu c. Mt pht trin cng ngh v nc khc tp trung vo cng ngh kh mn nhm ci to nc bin thnh nc sch c th dng c. Tuy nhin, chi ph nng lng cao kt hp vi quy trnh kh mn ni chung gii hn nhng ng dng nh vy n nhng khu vc nh Trung ng hay cc thnh ph duyn hi. Thng qua cng ngh thm thu ngc, Israel gim c chi ph kh mn n mc gi nc s dng thng thng.Nng nghip l ngun tiu th nc ng k nht, chim khong 70% ngun nc s dng trn th gii. Nn nng nghip trung bnh tiu tn 80% lng nc s dng nhng nc ang pht trin, v chim 95% ngun nc c s dng mt s quc gia m xut khu nng nghip l hot ng kinh t trng yu . Lin Hip quc c tnh rng cn t 2 -3 lt nc cung cp cho mc ch nc ung c nhn, v 20 300 lt cho nhng nhu cu ni tr. Tuy nhin, ch n hng ngy ca mt ngi li yu cu khong t 2000 n 3000 lit nc cho nng nghip v sn xut.Bt chp s bt ng a l ng k, thng l kh hay khng th vn chuyn nhng khi nc n nhng vng khan him nc. Tuy nhin, ngun nc o , hay ngun nc dng trong qu trnh sn xut nng nghip, chuyn t quc gia ny sang quc gia khc l h qu ca vic giao dich mua bn thc phm trn ton th gii. 60% nc s dng ton cu l t thc phm xut khu thay v thc phm cho ngun tiu th trong nc.Chin lc nhp khu ngun nc o l c th nhn thy i vi nhng quc gia khan him nc. Chng hn nh, Jordan, khong tm 80-90% ph thuc vo ngun nc o t nhp khu. Hiu sut s dng nc cn xng cng l nhn t ct li quyt nh loi hnh cy trng hay vt nui ca quc gia. Domestic gold prices slumped at the closing session on October 22. Shops nationwide at 4.00 p.m. quoted SJC gold bar at VND45.93 million and VND46.13 million per tael for buying and selling respectively, decreasing by VND500,000 per tael against the morning prices whereas there had been no significant difference in the price of the late last week and the morning.The Department of Education and Training of Phu Yen Province is requiring inflicting punishment on 18 teachers in Tay Hoa District because they have broken the rule on teaching extra classes. Some of them explained that they taught improperly just because they were asked by some students parents.