1. People can't live without oxygen.
2. People need to make our planet clearer.
3. We would like to see our rivers and lakes clean.
4. It is dangerous to pollute the environment.
5. There are a lot of things we can take from nature: gas, oil, wood, water, sand.
6. We pollute the environment when we are dropping rubbish on the street.
7. People should always remember that we can't recreate the resources of Earth.
8. Let's make our country clean and beautiful.