3 Y+ `! P4 T: a9 Q2 K5 Utvb now,tvbnow,bttvbtvb now,tvbnow,bttvb' Q% Z: X3 [: p* S- G9 c
No, I read that when the leaves fall it released CO2 back to nature.* t1 }% r+ r; P7 W: N+ G
I don't know its true or not.
9 v4 s5 m/ X) z4 \& p1 ftvb now,tvbnow,bttvbSweetLemon 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? |