2. We only have one earth, * * Under a blue sky, let's take new actions to protect and purify our earth.

3. It is urgent to control global warming

4. Environmental protection should be given priority in western development

5. There is only one earth in our home, and we cannot clone it

6.

9. Clean air and elegant environment are our * * * enjoyment, and everyone should do his duty to protect the environment.

1. Desertification, dust and red tide are the punishments of the environment to human beings.

11. Save the earth, starting with the details of life.

12. Protect the ecological environment and benefit future generations.