In general, Monckton's pronouncements on climate have been so ridiculous that no climate scientist or other prominent member of the climate community has wanted to even appear with him to lend him any credibility. However, this past February Tim Lambert of the Deltoid blog finally agreed to a debate - note Lambert is a computer scientist whose interest in climate is personal, not associated with his work. The resulting discussion was quite respectful - the full debate is viewable here on YouTube - and despite the Monckton-friendly audience and moderator showed Monckton exactly for the pompous clown he has become.
Now Peter Sinclair (greenman3610) has put together two brilliant video debunkings of Monckton's fantasies on YouTube, the second featuring Lambert and a great set of quotes from Margaret Thatcher, who Monckton proudly claims to have worked for in the 1980s: