7 p+ K# r" K Ptvb now,tvbnow,bttvbtvb now,tvbnow,bttvb# w" u: V! x+ D6 ~
No, I read that when the leaves fall it released CO2 back to nature.
9 X J8 O* u6 e; d1 \9 p/ r公仔箱論壇I don't know its true or not.
7 [, v8 i! \4 V. N( T, H5 USweetLemon 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? |