A source of bad conscience, however, is the knowledge that my way of life, austere though it may appear to the richer folk, is still ruinously exploitive of nature -- not in my backyard, where I practice harmlessness toward even the wasps, but in the atmosphere, where my fossil fuel combustion's carbon dioxide is helping change the climate; in all those mountainous places where the metals and minerals that structure and drive my American life are torn from the earth; and in the flesh of fish and birds, mammals, and reptiles, where the chemicals that made the paper and plastic I use bioaccumulate, deforming reproduction. That guilty knowledge is another argument for material simplicity. The less I consume, the less harm I do to that which I love. In a consumer society, harmless living may be simple, but it is not easy. I make no claim to exemplary harmlessness or simplicity.