You need to capitalize and punctuate correctly.
“Such as” weakens it and makes it sound less real. Are you proposing any controversial topic, or that one? It’s also unclear whether you are saying that the team concept is something you are also proposing, but only for the first topic. Also, a proposition is a statement not a question. e.g. Proposition: Drugs should be legalized. Also, the subjects are a little vague for debating purposes, but that might be ok depending on the context.