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8 x3 x0 M2 A% K' k! T. ]
free2penny 發表於 2016-7-12 09:30 PM

所以車有cabin air filter
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4 f) Q- w5 ?- b$ J8 m' a公仔箱論壇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。" K& C- i5 V$ t0 i9 G) y
SweetLemon 發表於 2016-7-14 10:34 AM

not enough trees in the city

Pedestrian_A

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& X& C. {) E, _9 z' g8 Xtvb now,tvbnow,bttvbNo, I read that when the leaves fall it released CO2 back to nature.
2 L, [5 [7 U% E" M* ]$ j( n8 `I don't know its true or not.9 ^) R/ K. J8 f6 k; r3 O. z
SweetLemon 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?