I'm a little confused. GP was simply pointing something out as maybe a good aspect of this kind of file transfer flow. It doesn't matter what "people think of environmentalism" in this case (and so many other cases). Environmentalism != the environment. Nobody was chastising you for having too big an email attachment.
In general I dont get this line where people think this stuff is all just a huge PR (as press relations) issue. It doesnt matter what you or I think. We are kinda way past that. There is no cultural battle to win, and even if there was, it really wouldn't matter!