The environment also provides services directly to consumers. The air we
breathe, the nourishment we receive from food and drink, and the protection we
derive from shelter and clothing are all benefits we receive, either directly or
indirectly, from the environment. In addition, anyone who has experienced the
exhilaration of white-water canoeing, the total serenity of a wilderness trek, or the
breathtaking beauty of a sunset will readily recognize that the environment
provides us with a variety of amenities for which no substitute exists