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Our planet IS a closed environment; of course, it is much bigger than your garage, and the time involved isn't minutes but decades, and there are a whole lot of other variables, but it should also be obvious that the "exhaust" of the world's day-to-day life has consequences that have to be addressed.

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Sunbathing helps your body produce Vitamin D, this is an essential nutrient, and therefore sunbathing is good for you.

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