Today he urges that we all do our bit by walking and using public transport a bit more, and using our cars less. I think this is an utterly brilliant idea. Like the Prince, whenever I drive around the country in my motor car, I find myself being quite repelled by the ghastliness of so many other road users. Their accents are frightful, their driving habits slovenly and their choice of music leaves a great deal to be desired. Quite a few of them, one imagines, don’t even have valets to put their toothpaste on their toothbrushes of an evening.

Get ‘em off the road and into buses, say I. Preferably buses without windows so one doesn’t have to look at them when one drives past in one’s bio-fuel-powered Aston Martin. Or one’s Range Rover. Or one’s two Jaguars. Or one’s two Audis.

And while we’re about it, let’s stop them all from flying too, shall we? It’s not as though any of these people achieve anything useful on their holidays, like galvanising captains of industry into screwing their smaller-scale competitors with their promises of carbon emissions reductions or painting sensitive water colours of hills near Sienna or climbing up and down Lochnagar with a shepherd’s crook.

Now I have no objection to this tack in principle: I have been guilty of it myself from time to time. (Oh all right, always). But here’s one of the key differences between Moonbat and me. Most of the things I advocate are going to make you richer, happier and free-er. Whereas, if anyone ever chooses to take any of the self-hating Old Stoic’s ravings seriously, we’ll soon all be living in caves, travelling round in coracles, and dining on nettles and ground acorns, while gangs of fascistic Misery and Ecological Righteousness Supervisors led by the Prince Of Wales, the Hon Jonathan Porritt and Zac Goldsmith patrol the realm in their BioFuel-powered Aston Martins whipping us (but not in a fun way) with organically grown birch twigs.

Anyway, that’s by the by. What I really want to do here is correct a misapprehension I’ve noticed among one or two blog comments of late: viz, that Aussie Professor Ian Plimer – author of Heaven And Earth – somehow chickened out of, or even lost his debate re Anthropogenic Global Warming with the Moonbat and that the subject was now closed.

What? Eh? Quoi? In your dreams Moonbat!

And I say “In your dreams Moonbat” because the only way anyone could possibly have reached this conclusion is by reading one of his magisterially self-deluding columns. (God they must have some stamina!)

Here are the facts. Prof Plimer offered to fly at his own expense from Australia to London to debate publicly with George Monbiot, fair and square, with no conditions attached.

Monbiot, as I reported before, was the one who chickened out. But he did it such a way as to try to present himself as the victor.

You can read for yourself in full the exchange of letters in which Monbiot wriggled out of the debate at the Moonbat’s website. A more perfect case of cognitive dissonance you rarely did see. The contrast between what Monbiot repeatedly tells you – that he won the debate because Plimer chickened out – and the evidence of their correspondence speaks for itself.

As promised Professor Plimer is now coming to London to lecture on Climate Change on November 12 at Savoy Place. If Monbiot is too scared to turn up and present his side of the argument, that’s his fault not Plimer’s.

I’m thinking, for example, of their championing of biofuels – a disastrous idea which not only helped starve the poor by causing a massive hike in global food prices but which has also led to still further devastation of their beloved rainforests. And also of the windfarms with which they plan to carpet the British landscape, in theory to save it from an apocalyptic future envisioned by their highly suspect computer models, in practice to render it ugly and unnatural and damaged almost beyond rescue.

The Hon. Sir Jonathon Espie Porritt, 2nd Baronet – he proposes a two-children limit on families

Or listen to Any Questions and hear it for yourself in the visceral hatred, contempt and shrill self-righteousness in the voice of ecology campaigner Sir Jonathan Porritt (Bart.) as he pours scorn on my suggestion that the Severn Barrage project will cause massive environmental damage to the bird-rich mud flats of the Severn Estuary (not to mention killing off one of Britain’s quirkier national phenomena, the mini-tidal-wave-like Severn Bore).

The £20 billion project, if it ever happens, will produce the same amount of energy as one nuclear power station – but at about eight times the cost. Porritt, naturally, is a huge fan – and seems to have little regard for the unfortunate environmental side-effects.

“Wonderful that James is such an ardent defender of the mud flats. At last he’s found a cause worth defending,” sneers Porritt doing his bravura impersonation of Alan Rickman’s oleaginously evil Professor Snape in the Harry Potter movies.

Elsewhere in the programme, Porritt calls me a “flat earther” and shrieks “Lies. All lies” when I make several perfectly truthful and valid statements questioning the so-called scientific “consensus” regarding Anthropogenic Global Warming. Needless to say, he makes no attempt to answer when I put to him that if, as Al Gore claims in An Inconvenient Truth global warming increases inexorably with higher CO2 emissions then how come, when CO2 emissions have continued to rise in the last 12 years global temperatures have actually fallen. Displaying the grandeur and pomposity you might imagine an-Old-Etonian-baronet turned eco-freak progressive would have striven a little harder to mask, Porritt carries on as if anyone who disagrees with him is scum quite beneath his contempt.

I’d never met Porritt before. I found his zealotry genuinely frightening, not least because – except when the mask slips, as I think it did on occasion during the programme, enabling listeners to make up their own minds as to what a piece of work this man is – he speaks his apocalyptic (and often scientifically dubious) views in a voice of such persuasive, modulated reasonableness. Worse still, he has the ear of our future King.

I didn’t mention this during the programme, because I thought things were already getting pretty mucky, but I do think there’s something a bit scary about a man who publicly advocates, in all seriousness, that couples should limit themselves to having two children only in order to save Mother Gaia from the deleterious influence of loathsome mankind. I come from a large happy family. I  love my little bro and my two little sisters. If we followed Porritt’s fascistic strictures, they wouldn’t now exist.

Was the programme quite as biased towards the liberal-left as I predicted in yesterday’s blog? Well to be fair to Jonathan Dimbleby I believe he tries as hard as he possibly can to be neutral. (As neutral as a man can be when he’s such a believer in AGW that he’s erecting a wind turbine in his Devon garden, much to the fury of some of his neighbours). The audience at beautiful Middle Wallop’s magnificent Museum Of Army Flying (highly recommended, especially for its Arnhem dioramas with Horsa gliders, and Gallipoli, a six-pounder that was actually used in the battle) were generous and pleasant. But I can’t pretend it wasn’t an uphill struggle being the only libertarian right-wing “AGW denier” against a panel of three liberal-lefties.

Even my nice neighbour, novelist Kate Mosse, who was supposed to be at best neutral came out on the deep green leftie side with possibly the most ludicrously stupid remark of the evening. If we put up with electric pylons, she said, we should put up with wind turbines too. And actually, she thought, the windfarms in South West France where she has her second home look rather pretty.

Yes Kate, and I’d bet they’d look even prettier with a makeover by Cath Kidston. Why on earth didn’t we think of this before?