Marcus Brigstocke
I might as well stop ever debating any of the 'big' topics (politics, religion etc.) with anyone. Just point them at the relevant Marcus Brigstocke clip. He pretty much sums it up, far more eloquently than I could ever hope for, and more forcefully (or arrogantly, if you prefer) than I have the confidence to pull off. So I won't try, and just let him speak for himself (sorry for the static-picture-plus-soundtrack Youtube links, it's the easiest way to link to them really): On climate change, for example, or on religion. Or even on less important things (but still close to my heart, after my experiences in the first few weeks after moving into this flat) - like British Telecom.