How to contribute to environmental protection in class? For example, exchanging things for things should be interesting and meaningful!

If you sell bottles, you can still make money ... or you can collect waste paper, homework papers, test papers and notebooks in class together ... The money you sell can be used as class fees and as a contribution to environmental protection. You can also organize the whole class to write some environmental protection slogans or papers and cartoons ... for social propaganda.

Or we didn't organize the whole class to pick up the white garbage on campus. What we can do is that environmental protection depends on everyone!