I love the excuse that it's too expensive to make the little changes that will last. (I'll tackle the inconvenience issue in another post...) I'll completely admit I'm not terrible creative with slogans... but I read this the other day and thought it would be short enough to tack on to an email:

Only when the last tree has been cut down,
Only when the last river has been poisoned,
Only when the last fish has been caught,
Only then will you find that money cannot be eaten.

— Cree Indian Prophecy