! M3 }' |/ r5 ltvb now,tvbnow,bttvb
( m7 B* c& f9 c公仔箱論壇No, I read that when the leaves fall it released CO2 back to nature.
* U o$ `) M$ D# C2 @5 x- J7 Z3 ltvb now,tvbnow,bttvbI don't know its true or not.& c w7 x' a O: H; s4 [
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? |