Emeritus professor Garth Paltridge, former chief research scientist with the CSIRO Division of Atmospheric Research.

Bear in mind too that no scientist close to the problem and in his right mind, when asked the specific question, would say there is only a very small possibility (that is, less than 5 per cent) that internal ocean behaviour could be a major cause of the warming over the past half-century. He would be particularly careful not to make such a statement now that there has been no significant warming over the most recent fifteen or so years. In the mad scurry to find reasons for the pause, and to find reasons for an obvious failure of the models to simulate the pause, suddenly we are hearing that perhaps the heat of global warming is being “hidden” in the deep ocean. In other words we are being told that some internal oceanic fluctuation may have reduced the upward trend in global temperature. It is therefore more than a little strange that we are not hearing from the IPCC (or at any rate not hearing very loudly) that some natural internal fluctuation of the system may have given rise to most of the earlier upward trend.
In the light of all this, we have at least to consider the possibility that the scientific establishment behind the global warming issue has been drawn into the trap of seriously overstating the climate problem–or, what is much the same thing, of seriously understating the uncertainties associated with the climate problem–in its effort to promote the cause. It is a particularly nasty trap in the context of science, because it risks destroying, perhaps for centuries to come, the unique and hard-won reputation for honesty which is the basis of society’s respect for scientific endeavour. Trading reputational capital for short-term political gain isn’t the most sensible way of going about things.
[…]
The trap was set in the late 1970s or thereabouts when the environmental movement first realised that doing something about global warming would play to quite a number of its social agendas. At much the same time, it became accepted wisdom around the corridors of power that government-funded scientists (that is, most scientists) should be required to obtain a goodly fraction of their funds and salaries from external sources–external anyway to their own particular organisation.
The scientists in environmental research laboratories, since they are not normally linked to any particular private industry, were forced to seek funds from other government departments. In turn this forced them to accept the need for advocacy and for the manipulation of public opinion. For that sort of activity, an arm’s-length association with the environmental movement would be a union made in heaven. Among other things it would provide a means by which scientists could distance themselves from responsibility for any public overstatement of the significance of their particular research problem.
The trap was partially sprung in climate research when a number of the relevant scientists began to enjoy the advocacy business. The enjoyment was based on a considerable increase in funding and employment opportunity. The increase was not so much on the hard-science side of things but rather in the emerging fringe institutes and organisations devoted, at least in part, to selling the message of climatic doom. A new and rewarding research lifestyle emerged which involved the giving of advice to all types and levels of government, the broadcasting of unchallengeable opinion to the general public, and easy justification for attendance at international conferences–this last in some luxury by normal scientific experience, and at a frequency previously unheard of.

It’s a humdinger. Send it to every politician and media contact you know.