Recent controversy over the handling of climate data has been seized upon by those intent on preserving their own financial interests, with potentially catastrophic results for us all. The upsurge in doubt among the general public is concerning - but it is lack of understanding that allows doubt and fear to thrive. What messages best help the man in the pub see the sense in tackling climate change?

Twisting facts.  Massaging data. Conjuring confusion, or pushing good, old-fashioned lies.