Hi Alice

I'd like to tell you about a campaign against littering the school field that I've recently carried out. First, we put up some posters on the school hallway, then we told janitor to report any students that are littering directly to their teachers. The last thing we did was showing students how hard it is to clean the school field. I think the least effective action was the last one because nobody really cared about it. Anyway, would you kindly advise me on what to do next in the campaign? I'd be thankful.

Regards,
Nikodem