A: At any one time, the atmosphere contains a staggering 37,500,000,000,000,000 gallons (140 000 000 000 000 000 liters) of water in the invisible state of water vapor.

Even if the world's 7.6 billion people consumed water from an atmospheric water generator, it would only use 0.002% of the water vapor in the atmosphere... just letting nature replace it over and over again! Having said that, water is in a constant hydrological cycle - meaning that once used, it all returns to the atmosphere.