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1 a" w( R" |1 [& w, a! P( i: S* \4 z, {No, I read that when the leaves fall it released CO2 back to nature.
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SweetLemon 發表於 2016-7-14 08:05 PM  A tree can absorb 13lb CO2 every year. A typical V8 car produce 220g CO2 per km. How many trees are needed? |