The common sentences about protecting the environment in English compositions are mainly common.

The environment has been polluted. The environment has been polluted. )

We must do something for the environment. We need to do something for the environment. )

We must protect our environment. We need to protect our environment. )

Attached are some words: oil smoke (tail gas), acid rain (acid rain), excessive building (dense building), overcrowding (overpopulation), global warming (global warming), inflation (poverty), famine (famine), alleviating pollution and cracking down on government corruption. I hope it works for you.