Could Thatcher have done more on climate change? Probably, but you have to bear in mind that the science was fairly new in 1989. In addition, you have to bear in mind that she was gone a year or so after giving the UN speech, as not being a very nice person caught up with her in the form of Geoffrey Howe. Perhaps she would have done more had she stayed in post. Trying to stay calm for ten seconds and trying to be objective in your response, had she survived the coup within the party and announced an accelerated pit closure programme to help to address climate change in say, the early 90s, would you have supported that or would you have denounced the science as a Tory trick and pushed for another strike?
On the question of doing more to address climate change, this site has recently seen a poster saying that he could easily do more, but declining to do so. I also noted your comments about pies on the 'Is football fixed' thread. Are the pies you enjoy climate friendly vegetarian ones?
The ‘bluff and bluster’ are figures coming from NCB accounts and from a Monopoly and Mergers Commission investigation into the coal industry. The industry was losing money hand over fist. That had to be addressed.
I agree that coal from South Africa would have been a concern given that country was an apartheid regime at the time, but Australia and America? Come on.
I agree that geological problems were not necessarily endless, but the Tories had nothing to do with the decision to close Maltby. It was owned at the time by Hargreaves Services Ltd, who had shelled out £21.7m for it in 2007. It wasn't an asset that they would lightly dispose off. Indeed, their share price took a serious kicking in the face of the problems:
https://www.thisismoney.co.uk/money/...ion-hitch.html
Your concerns that it could suit the Tories to cite geological problems bring me back to the question I asked earlier; if you think economic reasons were not behind the ending of the mining industry in the UK, what do you think was?