如果地球冇晒清新空氣嘅樹木，甚至一棵也沒有，人類仲可否活？

人類呼出二氧化碳，吸氧氣。樹木正正與我們相反。

近年，human過量砍伐樹木，building cause 嘅屏風，引致都市人疾病出現。Therefore,if we have no trees,we will have no 氧氣，we will die!

2011-05-21 11:10:34 補充：
If we have no trees,we can't survive!

2011-05-21 11:10:58 補充：
Trees are important!

2011-05-21 11:11:17 補充：
We need to protect trees!

2011-05-21 11:12:07 補充：
We can help to grow trees!

2011-05-21 11:13:06 補充：
Trees are important as our water and food!

2011-05-24 17:49:39 補充：
Trees are precious!

不可以,the trees are important for us .with out them ,we cannot life in the world .they are so important like water.