It's easy to find zero-VOC paints in stores today (VOC stands for "volatile organic compounds," or the odor in paint). But in order to keep the untinted zero-VOC paint as eco-friendly as possible, go easy on the color and sheen. Choose a flat finish instead of glossy: Chemicals are added to make paint glossy. Choose light colors instead of dark tints; the lighter the finished color, the fewer colorants need to be added to make it that color. Finally, use an online paint calculator to know exactly how much paint you need to do a room. Simply enter the room's dimensions, and the calculator tells you how much paint to buy. No guessing and less waste.