micro devices for macro effect

Discussion about the WaterMill -- a small-scale dehumidifier that collects and cleans water from the air -- leads to conjecture not only about how much of our drinking water could come from the air, but also about whether the urban microclimate could be significantly altered by installing thousands of these low-energy devices. Could we do away with a significant number of energy-sapping air conditioners by making our environment more comfortable through a combination of better building design, appropriate clothing, vegetating the landscape and reducing the ambient humidity with thousands of WaterMills?