Tomorrow I will be acting as a judge on the Debating Matters final. The debaters are given a topic guide which I've been enjoying reading. As well as being a resource itself, it also contains a good bibliography for further reading. As such, I thought I'd promote it: it's free to download (pdf, 10 pages).
"Space Exploration is a Waste of Time and Money" Debating Matters topic guide by Rob Lyon, January 2015.