I have seen people spitting and throwing cigarette butts in the high-rise buildings in the community. I look up and worry every time I walk over. What should I do?

You should stop this uneducated person loudly and even scold him. Who is so shameless to throw things away? What if you hit someone? You are an ancestor. He knows that he is wrong, and he will run away when he hears it. If he dares to scold you without taking advice, you should call the police at once!