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Carbon dioxide
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Carpet recycling
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Carpool
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Cell Phone recycling
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File:CFL.jpg
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Chemicals used in paper manufacturing
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File:Chlorine-sodium-chloride.jpg
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Chopsticks recycling
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Coal
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Cold showers
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Compact Fluorescent Light Bulbs (CFL)
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Compost
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Composting toilet
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Computer recycling
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Concrete recycling
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Cotton recycling
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Cup recycling
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