Going Green...or yellow

I've been reading a book entitled The Green Book lately. It gives helpful hints for "going green" in various areas of life. Amongst all of the ways I'm trying to be environmentally conscious is the practice of "If it's yellow, let it mellow..." Yes, I'm making an attempt to only flush every other time I "yellow." It sounds like it should be easy, but man, am I like Pavlov's dog. I'll be standing there thinking, "OK, I'm not gonna flush this time" as my hand reaches out and flushes. Who knew going green would be so difficult.