BBC’s Renouf to Keith Briffa: ‘Your essential job is to ‘prove’ to [host Paul] Rose, that what we’re experiencing now is NOT just another of those natural fluctuations we’ve seen in past’
'The hockey stick curve is a crucial piece of evidence because it shows how abnormal the present period is - the present warming is unprecedented in speed and amplitude, something like that. This is a very big moment in the film when Paul is finally convinced of the reality of man made global warming'
