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2014-10-08T22:18:50+08:00

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There's a lots of ways for CO2 gets into the air. Exhaling is one bcoz you produced CO2, another is also burning of fossil fuels and the exhaust from cars. and I think you just need 3 :)
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2014-10-10T18:39:37+08:00

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First way in carbon dioxide gets into the air because it's evaporating

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