Somewhere around the early 1990s, I borrowed several back issues of Analog Science Fiction and Fact from a friend. I believe this was when and where I read a "Sherlock Holmes" story which someone in the late 80s or early 90s had submitted to the magazine.
It was written in a fairly conventional way -- Dr. Watson as the narrator; set in the late 19th Century; Mycroft Holmes makes an appearance . . . in other words, nothing in it that squarely contradicted the "canonical stories" by Doyle.
The twist -- and this was what got it published in a science fiction magazine -- was that it involved a scene in which Mycroft Holmes explains why Her Majesty's Government feels it necessary to take drastic measures to suppress a British scientist's radical theory that a sharp increase in the quantity of carbon dioxide in the Earth's atmosphere can have, over time, a heavy impact on weather patterns, average temperatures, and the like. The feeling was that burning coal and natural gas was vital to the economic strength of the British Empire, and thus it would be self-destructive, at that time, to start putting the common people into a panic over the possibility of long-term global warming.
But, Mycroft assures his listeners, in another hundred years or so, things might be very different!
So Holmes and Watson patriotically agree to be part of the cover-up for the time being . . . but of course Watson writes it all down for posterity.
Does anyone remember who wrote this story, and the title of it?