3.
In recent years, our environment is becoming worse and worse. Why that? There are many reasons that cause the environmental pollution such as: the smoke, the chemicals, the oil and so on. But the main reason of the pollution is the garbage. People often throw trash and rubbish everywhere. To solve this problem, I can give some following solutions.

Firstly, throw trash into a trash bin to keep the environment clean.

Secondly, reuse and recycle bottles and cans to reduce garbage and save natural resources.

Finally, put the trash bin around your neighborhood to keep it clean.