We know how to solve water scarcity, but we are failing to fund the solutions
Water choices have always been central to the development of nations. After its banks broke in the 11th century, the Po river abruptly changed course, diverting sediment-rich waters into to the lagoon of the Republic of Venice. Left to run its course, eventually sediment would have filled up the lagoon, grounding the city. Modern simulations show that, if that scenario had occurred, Venice today would have been a quaint village some five miles inland from the coast...
Source: The Guardian 11 March 2014