Irrational use/misuse of water will result into an incalculable harm to the human civilization.
And the future generations will hardly pardon us.
The present generation has to start preserving the water in as many ways that it can by minimizing the use of water and pass the culture of preservation and saving to the new generation as well before it is too late.
Advancing deserts will otherwise engulf the human civilization and dwarf it to a miniscule pockets of Bedouin tribles, simply called badwees.