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Evaporative cooling

What happens when you perspire on a hot day? The sweat evaporates, using heat from your body in the process, resulting in a cooler you. This passive cooling system works by the same basic principle: Water is evaporated into hot, dry air, causing the air's temperature to drop. A fan is employed to distribute the cool, moistened air around a room or building. Evaporative cooling systems, sometimes called swamp coolers, are very effective in arid climates, and can use as much as 75 percent less energy than standard air conditioners. They are less effective as humidity rises.

 

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If The Graduate were remade today, it might be this phrase ringing in Dustin Hoffman's ears as the key to his future: bioplastics. Plastic does not necessarily have to be made from petroleum. Bioplastics are made from renewable, natural sources such as plant starch and sugar cane; once disposed of, they will safely and naturally biodegrade. Some bioplastic products can even be composted in ordinary compost piles.

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