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...we don't install urinals in all homes?
Businesses do it to cut down on the water usage due to male patronage as a urinal uses only a fraction of the water a sitting toilet does. Hell, there's even a device that allows women to use a urinal as well. Hell, there's even waterless urinals that use a reverse osmosis drain to prevent seepage.
While we are on the subject of conservation: Why aren't we painting all roofs white?
A change of color actually changes the temperature. White reflects more light than darker colors do and absorbs less heat from sunlight. It's partly why scientists are so worried about the ice caps melting, not only will rising sea levels -blam!- us but there being more dark ocean absorbs more heat, thus creating a vicious cycle.
[Edited on 12.19.2012 8:30 PM PST]