提示词语：population, limit, time, reuse, call on
What should we save?
Why should we save it?
What do we usually do to save it?
In my point of view, all of us should save water. People can't live without water. But the real situation is that the shortage of water is becoming a serious problem in many parts of the world due to growing population and the pollution of the rivers and lakes.
To deal with the water problem, we can do something to avoid wasting water in our life. Firstly, we should remember to reuse water. For example, the water left over after washing vegetables can be used to water plants or to clean the floor. Secondly, we had better limit our shower time. Also, we can call on more people to save water in different ways.
In short, water holds great value to human beings. Let's do as much as we can to save water.