▁s izable ▁additional ▁amounts ▁of ▁fresh water ▁to ▁operate . ▁ ▁This , ▁however , ▁has ▁led ▁to ▁increases ▁in ▁air ▁and ▁water ▁poll ution , ▁which ▁in ▁turn ▁have ▁reduced ▁the ▁quality ▁of ▁water ▁supply . ▁More ▁sust ain able ▁development ▁practices ▁are ▁advantage ous ▁and ▁necessary . ▁ ▁According ▁to ▁the ▁W HO , ▁each ▁human ▁being ▁requires ▁a ▁bare ▁minimum ▁of ▁ 2 0 ▁lit res ▁of ▁fresh ▁water ▁per ▁day ▁for ▁basic ▁h yg iene ; ▁this ▁equals ▁ 7 . 3   c ub ic ▁metres ▁( about ▁ 2 5 5   ft 3 ) ▁per ▁person , ▁per ▁year . ▁Based ▁on ▁the ▁avail ability , ▁access ▁and ▁development ▁of ▁water ▁supplies , ▁the ▁specific ▁usage ▁figures ▁vary ▁widely ▁from ▁country ▁to ▁country , ▁with ▁developed ▁nations ▁having ▁existing ▁systems ▁to ▁treat ▁water ▁for ▁human ▁consumption , ▁and ▁deliver ▁it ▁to ▁every ▁home . ▁At ▁the ▁same ▁time ▁however , ▁some ▁nations ▁across ▁Latin ▁America , ▁parts ▁of ▁Asia , ▁South ▁East ▁Asia , ▁Africa ▁and ▁the ▁Middle ▁East ▁either ▁do ▁not ▁have ▁sufficient ▁water ▁resources ▁or ▁have ▁not ▁developed ▁these ▁or ▁the ▁infrastr ucture ▁to ▁the ▁levels ▁required . ▁This ▁occurs ▁for ▁many ▁varied ▁reasons . ▁It ▁has ▁resulted ▁in ▁conflict ▁and ▁often ▁results ▁in ▁a ▁reduced ▁level ▁or ▁quantity ▁of ▁fresh ▁water ▁per ▁cap ita ▁consumption ; ▁this ▁situation ▁leads ▁toward ▁disease , ▁and ▁at ▁times , ▁to ▁star v ation ▁and ▁death . ▁ ▁The ▁source ▁of ▁virt ually ▁all ▁fresh water ▁is