Why do people plant trees? It's easy. Because they want to protect the environment. Many people just want to make money by cutting down trees. So more and more trees are cut down by them. But kind people want to protect the environment and make the air clean. So they plant as many trees as possible.

Why do people plant trees? It's simple. Because they want to protect the environment. Now many people want to make money by cutting down trees. Therefore, more and more trees will be cut down by them for the benefit of money. But kind people want to protect the environment and make the air fresher, so they will try their best to plant trees.

All these actions show that people should pay more attention to the environment. We want to make it better, don't we? So we must plant more trees to protect the environment.

All these behaviors show that people should protect the environment better. We want our world to be better, don't we? So we must plant more trees to protect the environment.

So, everyone, if you want to make the air clean, please do your best to protect the environment and plant more trees.

For everyone, if you want to make the air cleaner, please protect the environment better and plant more trees.