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
" [% O) a3 v0 ^! {! U. |5.39.217.77free2penny 發表於 2016-7-12 09:30 PM

所以車有cabin air filter
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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。
5 R% B2 I( l4 p% _- `0 y' ^tvb now,tvbnow,bttvbSweetLemon 發表於 2016-7-14 10:34 AM

not enough trees in the city

Pedestrian_A

( ?1 n/ N9 j: S4 `tvb now,tvbnow,bttvb
  i3 c! x0 V1 y2 n# R. k) ]公仔箱論壇No, I read that when the leaves fall it released CO2 back to nature.
! W" q! N9 L' O; J公仔箱論壇I don't know its true or not.
( @2 O1 ?9 @3 t9 K" \0 b# _; U公仔箱論壇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?