plastic膠的壤處

並不是任何的膠都是non-biodegradable架。依家超市啲膠袋係bio-degradable,，加咗啲starch，搞到佢bio-degradable。

Disadvantage of using plastic:
1. Some of the plastics are non-biodegradable, so they will remain in the landfill site and this will shortage of land for landfill.
2. Burn the plastics in incinerators will lead to air pollution problems (Toxic gas, greenhouse gas, acidic gas, e.t.c.)
3. Many plastics are flammable, so there will be a fire risk of keeping plastics.
4. Toxic and harmful fumes produced by burning plastics will harm the respiratory tract.
5. Some of the additives in the plastics are reusable. However, it is very difficult to sort out plastics from rubbish. So the reuse of these useful substance is not feasible.


Things made of plastics
a. Toy
b. Water pipe
c. plastic box
d. Bottles
e. electric sockets
f. table cloth
g. clothes
h. nylon string

And many many...

圖片參考：http://hk.yimg.com/i/icon/16/1.gif
任何 plastic 也是 non-biodegradable 的，因為它們很難分解。即使可進行分解，也會排放有害氣體。故不需用任何方法分析是 biodegradable 或 non-biodegradable 了。

圖片參考：http://hk.yimg.com/i/icon/16/9.gif