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4 ?+ I: m# f8 k' ]) G K Atvb now,tvbnow,bttvbNo, I read that when the leaves fall it released CO2 back to nature.6 h' U* }6 r2 z3 r1 v! ]' T& O$ d, S
I don't know its true or not.5.39.217.77:8898( k1 G1 [, z) V' A, u
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? |