What is the most challenging?

Environmental protection activities are the most challenging. It really takes courage to personally discourage adults from damaging the environment.

In practice, we find that rational and well-intentioned reminders are often better than warnings, while yelling loudly is counterproductive. When our dissuasion is well-intentioned, it solves not only the problem of a cigarette butt and some rubbish, but also the reflection and introspection of the other party on their own behavior, which can be seen from their shameful expressions. The value of textbook knowledge is no longer measured by scores, but a living tool, a tool to help us understand society, gain insight into people's hearts and communicate with others. This is also our unexpected feelings and gains.