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4 L1 O+ |+ b5 L9 _1 N公仔箱論壇No, I read that when the leaves fall it released CO2 back to nature.
5 b* C4 b/ t7 y" I, I, }- }( |tvb now,tvbnow,bttvbI don't know its true or not.
. O4 J- e& @ F; x- K1 kSweetLemon 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? |