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! m/ N5 `6 H0 x/ @( Ttvb now,tvbnow,bttvbNo, I read that when the leaves fall it released CO2 back to nature.
7 [7 B: [1 l, f+ F# {8 S8 wI don't know its true or not.
" X& _: b: p5 [" |& Dtvb 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? |