We have only one earth to live

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解题过程：
We have only one earth
As is known to us all, we live on the beautiful earth on which we can breathe fresh air, see the fantastic landscapes, and maybe we have a chance to enjoy ourselves. I find it fortunate that I can read、listen and feel all wonderful things.
But to some degree, we human beings take that we can enjoy these wonderful things for granted. So we do everything that is good for us but bad for environment. The examples are as follows. On the one hand, a large amount of people establish many companies which produce harmful gas. These people only focus on making money, even if our earth is in bad conditions. On the other hand, we always think it isn’t our duty to protect our earth mother. So maybe in the zoo, we can easily see a number of people walking across the lawn to save some time and some other people throwing little to the clear water.
Just to think about it, we have only one earth. It is known to us all that we can not live on without earth. We can come to a conclusion that we are supposed to protect our environment. And also it is our duty to call on people around us to do something good to our earth mother. For example, we can spare no effort to save electricity. And we can try our best to pick up little. I hope that we can have a better earth to live on.