//My contgention is that such a conclusion is not proveable,...//
No it's certainly not. But even if it was, there is more to the debate than that. This country is embarking (at least for the moment) on a strategy that will near enough bankrupt it, will kill its economy stone dead and will cause harm and hardship to the majority of the population. And what for? The UK could cut its emissions to absolutely zero (not the contrived "net zero" that is bandied about) tomorrow. And it would make precisely no difference whatsoever to the perceived problem. The big producers (USA, China, India) have no intention at all of making any meaningful contribution to reductions. China is opening a new coal fired power station about every ten days, the USA burns over 700m tons of coal a year India 960m tons and China 4,300 tons. Even Germany burns more than six times as much coal as the UK at more than 250m tons (25% of which they have to cart half way round the world). Six of Europe's top ten carbon emission origins are German power stations. By contrast the UK burns 45m tons (90% imported) which is around 1% of that burned by China.
This is virtue signalling to a world that has no virtue of its own and the country's fanciful ideas that it should "lead by example" is pathetic. This country will stagnate whilst the rest of the world ploughs on. With the strategy that is proposed at present, some serious damage will result, and it won't be a half degree rise in global temperatures that the people of the UK will have to worry about.
All the world's Great and Good will jet in to Glasgow in a few weeks time, spend a few days noshing some agreeable dinners, get their lackies to draft a few "resolutions", then they will all jet back again to continue stoking their furnaces. Meanwhile we will fanny about with windmills, lightbulbs and burning wood shipped 5,000 miles across the Atlantic whilst watching our industries decline and our people become impoverished. All because it makes us look good.