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。 " ^ H, R+ t# B+ X! X8 l/ a
SweetLemon 發表於 2016-7-14 10:34 AM 
& q' a/ x, C) F9 l6 Z2 i2 l4 E5.39.217.77:8898not enough trees in the city 5.39.217.77:8898, T: q- X# K" Y
4 R$ P- e( t( y# ?# o
No, I read that when the leaves fall it released CO2 back to nature.
/ J+ m, c" S) r* P. _! yI don't know its true or not. |