I have worked in government for 28 years as an economist, and for the last 20 years I have worked on environmental programs. In that time I have not seen a shred of evidence to justify global warming, let alone man made global warming and I have not seen a shred of evidence that there is going to be a green economic boom. The only evidence I have seen is that there is a green economic bust, that money invested in green technologies is usually wasted and simply consumes investment that could be better used elsewhere. I think that anybody in government or industry who can not understand this is either dishonest, stupid, or both. That applies to Cameron - I think he is both.