Environment

I gave it little direct thought, but for years my instinctual assumption was that the line at the bottom of emails,

Please consider the environment before printing this e-mail.

...was a suggestion that you make sure you knew who was around your printer - ie, the "environment" - before choosing to print out the email. Like an ATM warning - make sure you trust the people around you before making a new copy of this email, which could then be carried off. It just sounded like those other pompous footers, like

NOTICE: If received in error, please destroy and notify sender. Sender does not intend to waive confidentiality or privilege. Use of this email is prohibited when received in error.

I don't know why the other obvious - correct - meaning of the message escaped me!