The answer is — or should be — a no-brainer: adapt. I mentioned earlier that a resumption of global warming, should it occur (and of course it might) would bring both benefits and costs. The sensible course is clearly to pocket the benefits while seeking to minimise the costs. And that is all the more so since the costs, should they arise, will not be anything new: they will merely be the slight exacerbation of problems that have always afflicted mankind.

Like the weather, for example — whether we are talking about rainfall and flooding (or droughts for that matter) in the UK, or hurricanes and typhoons in the tropics. The weather has always varied, and it always will. There have always been extremes, and there always will be. That being so, it clearly makes sense to make ourselves more resilient and robust in the face of extreme weather events, whether or not there is a slight increase in the frequency or severity of such events.

This means measures such as flood defences and sea defences, together with water storage to minimise the adverse effects of drought, in the UK; and better storm warnings, the building of levees, and more robust construction in the tropics.

The same is equally true in the field of health. Tropical diseases — and malaria is frequently (if inaccurately) mentioned in this context — are a mortal menace in much of the developing world. It clearly makes sense to seek to eradicate these diseases — and in the case of malaria (which used to be endemic in Europe) we know perfectly well how to do it — whether or not warming might lead to an increase in the incidence of such diseases.

And the same applies to all the other possible adverse consequences of global warming. Moreover, this makes sense whatever the cause of any future warming, whether it is man-made or natural. Happily, too, as economies grow and technology develops, our ability to adapt successfully to any problems which warming may bring steadily increases.

Yet, astonishingly, this is not the course on which our leaders in the Western world generally, and the UK in particular, have embarked. They have decided that what we must do, at inordinate cost, is prevent the possibility (as they see it) of any further warming by abandoning the use of fossil fuels.

Even if this were attainable — a big "if", which I will discuss later — there is no way in which this could be remotely cost-effective. The cost to the world economy of moving from relatively cheap and reliable energy to much more expensive and much less reliable forms of energy-the so-called renewables, on which we had to rely before we were liberated by the fossil-fuel-driven Industrial Revolution — far exceeds any conceivable benefit.

It is true that the notorious Stern Review, widely promoted by a British prime minister with something of a messiah complex and an undoubted talent for PR, sought to demonstrate the reverse, and has become a bible for the economically illiterate.

But Stern's dodgy economics have been comprehensively demolished by the most distinguished economists on both sides of the Atlantic. So much so, in fact, that Lord Stern himself has been driven to complain that it is all the fault of the integrated assessment models, which — and I quote him — "come close to assuming directly that the impacts and costs will be modest, and close to excluding the possibility of catastrophic outcomes".

I suggested earlier that these elaborate models are scarcely worth the computer code they are written in, and certainly the divergence between their predictions and empirical observations has become ever wider. Nevertheless, it is a bit rich for Stern now to complain about them, when they remain the gospel of the climate science establishment in general and of the IPCC in particular.

But Stern is right in this sense: unless you assume that we may be heading for a CO2-induced planetary catastrophe, for which there is no scientific basis, a policy of decarbonisation cannot possibly make sense.