IMAGINE A HIKER IN THE FOREST. The leaves form a cool screen for the rippling of a crystal-clear brook. An invigorating piney breeze caresses his face. The trilling birds and whispering wind ease his mind. Until, that is, he whips out a calculator andmutters: "OK, leaves for sun screen and whispering wind, 153.49 dollar a year; clear water for brook, 2.49 dollar per 1,000 gallons; piney breeze, 15.92 dollar; birds, 95 cents apiece. Yeah, I guess it's worth it. But how much are those deer over theregoing to run me."
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