3 U9 i, M4 Q% c; o2 s9 x5 N- C$ l3 Ytvb now,tvbnow,bttvb: T) B! O3 a2 }1 v& O+ G3 b
No, I read that when the leaves fall it released CO2 back to nature.
* i& t) R0 h! Z6 ptvb now,tvbnow,bttvbI don't know its true or not.
! x E: c' G- y$ `tvb 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? |