For those who don’t know, the Oxford Union is the top of the food chain for scholarly debate
Monckton has long since been discredited, his claims thoroughly debunked, particularly his inflated claims of his own credentials. potholer54 has shredded Monckton's arguments before the above "debate" even took place, as you can see below.
For those who are interested in learning more about Climate Change and seeing the myths on both sides of the discussion debunked, I invite you to watch this playlist. https://www.youtube.com/playlist?list=PL82yk73N8eoX-Xobr_TfHsWPfAIyI7VAP ; you will find these videos in it.