In February this year I had the privilege of speaking at the Oxford Union, a well known debating society run by students of my alma mater. I was invited to oppose the motion “This House Would Populate Mars” in an evening debate. I opposed the motion for three reasons: the extreme unpleasantness of human life on Mars, the lack of any compelling need to settle other planets, and the obligation to preserve the aesthetic, cultural and scientific value of extraterrestrial environments indefinitely for future generations. The motion was defeated. Also speaking in the debate were Dr Greg Autry of Arizona State University, Alfredo Munoz of the Space Architecture Technical Committee, Dr Sylvia Ekstrom of the Geneva Observatory, and the science journalist Dr Anjana Ahuja. My speech can be seen on Youtube below.