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Old 01-02-2013, 10:29 PM   #318 (permalink)
NeilBlanchard
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It's where the carbon comes from that matters to the long term level in the atmosphere. Fossil fuels (oil, coal, natural gas) all add "old" carbon into the air, raising the long term level of carbon dioxide; while burning wood or other biofuels like methane from sewage or farm waste digesters does not.
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