As you know its about politics not science. Thatcher was right-wing and Zionist and promoted man made global warming because she wanted to use it as a way of promoting nuclear power as an alternative to socialist coal and Arab oil. And its still promoted as cover for Trident.
The problem is for some religious minded people an official ploy becomes the new old time religion and careerist politicians follow rather than dare commit heresy but pointing out its all nonsense.