tvb now,tvbnow,bttvb& H6 E# @/ x0 J/ R" Z2 `
" n7 g( R% L2 P* g* ~* Wtvb now,tvbnow,bttvbNo, I read that when the leaves fall it released CO2 back to nature.
6 \2 H& o& u! I) V+ `* Dtvb now,tvbnow,bttvbI don't know its true or not.
0 f9 ]( {: l/ {4 fSweetLemon 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? |