Cars pollute. Everyone knows that because when you turn the key, they emit exhaust and fumes. Garages need to be ventilated because of the carbon dioxide (and carbon monoxide) that cars emit.
PCs pollute as well. PCs pollute a lot more than most people might imagine. Because PCs don't emit exhaust and fumes, we don't think about that pollution. It happens in someone else's backyard. Fifty percent of the electricity in the United States is generated using coal. Burning coal is a very, very dirty way to generate electricity.
Both cars and PCs pollute. In fact, it only takes TEN personal computers to create the same amount of pollution as ONE car. That's right, the ratio is pretty small. Ten PCs running 24 hours per day, 365 days a week create the same pollution as ONE average American car (which means it gets 24 mpg and is driven 12,000 miles per year).
Many people keep their computers running all the time. But you don't have to. If you want to reduce the amount of pollution that your PC creates, you can take one simple step: turn it off when you are not using it. People don't run their cars 24 hours per day, and people shouldn't run their computers 24 hours per day.
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