From the BBC interview and a Q&A with Professor Phil Jones in question...
E - How confident are you that warming has taken place and that humans are mainly responsible?
I'm 100% confident that the climate has warmed. As to the second question, I would go along with IPCC Chapter 9 - there's evidence that most of the warming since the 1950s is due to human activity.
H - If you agree that there were similar periods of warming since 1850 to the current period, and that the MWP is under debate, what factors convince you that recent warming has been largely man-made?
The fact that we can't explain the warming from the 1950s by solar and volcanic forcing - see my answer to your question D.
I - Would it be reasonable looking at the same scientific evidence to take the view that recent warming is not predominantly manmade?
No
Phil Jones, the professor behind the "Climategate" affair, has admitted some of his decades-old weather data was not well enough organised.
He said this contributed to his refusal to share raw data with critics - a decision he says he regretted.
But Professor Jones said he had not cheated over the data, or unfairly influenced the scientific process.
He said he stood by the view that recent climate warming was most likely predominantly man-made.
News sources can distort the accepted scientific practice of never speaking in absolutes, dealing instead in probabilities based on the data. I am personally satisfied that global climate change is both real and predominantly manmade.
