Why don’t Outlook, and web browsers, have something in the pagination engine that detects when there are fewer than 5 lines of text on the final page of a printout. When it finds this, it shrinks the text/spacing (by a level most people wouldn’t notice on a multiple page document) and repaginates it to avoid that overspill and save 1 sheet printing.

This only really works for plain text and HTML, where there isn’t (usually) explicit pagination, but would be largely transparent to users (Word did have a “shrink by 1 page” button, I’m unsure if this still exists, and using it requires user intervention.).

No longer would the phrase “please consider the environment before printing this email” languish alone on its own bit of paper.