Pedestrian_A

真實加拿大一号公路

Pedestrian_A

交通空氣污染應該都幾嚴重呀
6 g/ T* Y% O* h* h" X  Ntvb now,tvbnow,bttvbfree2penny 發表於 2016-7-12 09:30 PM

所以車有cabin air filter
5 F/ H# q8 }/ B2 L2 G: m公仔箱論壇

9 I9 e5 \2 x! N: I2 C加拿大很多樹但也期望森林吸收掉人們無節制排放的二氧化碳。
: ^0 A9 i5 d3 _! y7 zTVBNOW 含有熱門話題，最新最快電視，軟體，遊戲，電影，動漫及日常生活及興趣交流等資訊。SweetLemon 發表於 2016-7-14 10:34 AM

not enough trees in the city

Pedestrian_A

公仔箱論壇+ O" L0 b7 X3 ~: w' Y

! f; ^, W0 p: W4 \No, I read that when the leaves fall it released CO2 back to nature.公仔箱論壇* ]- W$ S) s" |
I don't know its true or not.
8 L9 K7 r' `, S5.39.217.76SweetLemon 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?