To put things into recycling bins. To use less electricity, such as use fan rather than air conditioner. To use both sides of a paper. I always do the above things everyday. This is a small power that help a little bit protecting the environment. However, it is a large power if every one will do these things altogether. And the most important thing is that we should change some cultures in office and disposal of waste. In HK, many rubbishes always are on streets, not in rubbish bins, no matter put them into recycling bins. Besides, the culture of office is not environmental-friendly. Even though people will use both sides of papers, it is still not enough and it is a kind of waste. Many people will print a document many times because they discover some mistakes in the document and just correct it. Those mistakes might be just the size of word not same or the form is not right. Do you think it is really important to print the document again? Many workers will do it because they are so afraid of blames from their boss or supervisor. This action kills our environment. All in all, our environment will be improved if we can change some cultures and personal behaviour. The power of individual is very small. But the power of a group of people is unlimited.