On Earth Day, you are probably going to be overwhelmed with advice on how to save the planet. You’ll hear things like: Plant a tree Recycle your plastic, cardboard, and aluminum Use reusable grocery bags Take shorter showers These are fine suggestions. They help to limit our negative impact, and perhaps more importantly, they help us train ourselves to be mindful of our choices. Now, some more adventurous sources will have suggestions like: Downsize you...