Conscience, Not Religious Dogma, is the Motivator
If you lived with my wife, you wouldn't ever toss anything in the garbage that can be recycled. Plastic, paper, metal cans and glass jars get dropped in individual recycling bins in the garage. Vegetable peelings go to the compost, even if I have to tramp through the snow. My wife sets the heating in the home at least two degrees below comfortable in winter, and the air conditioning a few degrees higher in summer. Now she's pushing for solar panels on the roof.

