Sydney, final Australia post

As I get ready to leave the english speaking world, I noticed, for really the first time a cultural difference that has left me baffled.
Perhaps someone can comment and let me know if I have read this sign wrong.
For those of you unfamiliar with this image (I suspect half of you have limited experience with this device) it is a urinal. Posted above the urinal was one of the funniest signs I have ever read. I would have peed in my pants, if I wasn't standing in front of a urinal. The second image is a close up of the sign. Take a moment to read it and perhaps re-read it, I did a few times.
Apparently, should the urge arise, one should find a less environmentally friendly bathroom before one drinks from the urinal.