In the one camp are people who think that and which should be used in different circumstances, exclusively. They feel those differences are vital.
In this camp, that is a word that restricts meaning; which does not. Which adds information but is not necessary to understanding the main clause. Satellites will fall from the sky if the spec docs use which where that applies.
Whither the subjunctive? The subjunctive mood is what we use—what we sometimes use—when we are expressing what is possible, what we wish to be true or imagine to be true but is not. If it is true, the mood is not subjunctive.
The thing is, not everyone uses it, and most people are OK with ignoring it in casual writing. The subjunctive may be going the way of thou and thither and whence and whither.
National Grammar Day is 10 short days away, on March 4th, the day of the year that forms a handy imperative sentence. It’s not all commands and demands, though. You’ll have a number of fun options for celebrating. Here are a few you'll want to check out:
The next issue of Copyediting newsletter is due out in a few days. The issue didn’t raise a lot of debate, as some past issues have. One debate we did have was whether the adjective alternate could be used to mean “alternative; referring to a choice.”
From The Business of Copyediting article:
If you prefer an alternate/alternative spelling, you may be able to secure it a spot in your style sheet.