በ 1,4 ኛው ክፍለ ዘመን መባቻ ላይ ማህበረሰቦቻችን በ 15 ኛው መቶ ክፍለዘመን መጨረሻ ላይ ካለው ተመሳሳይ ችግር ጋር ተቃራኒ በሆነ ሁኔታ ይጋፈጣሉ-እያንዳንዱ ሰብዓዊ ፍጡር የመጠጥ ውሃ ማግኘቱን ያረጋግጣል ።
At the dawn of the twenty-first century, our societies are paradoxically confronted with the same problem as at the end of the nineteenth century: to ensure that every human being has access to drinking water.