American free-enterprise is often accused of being extremely wasteful of natural resources.  But according to the policy group, PERC, a look a just a few areas of production reveals that red, white and blue capitalism goes quite well with Green concerns.  Take aluminum cans, for instance.  Due to some impressive engineering, the walls of these cans are now thinner than two magazine pages, and the product is 80 percent lighter than the steel cans of just three decades ago.  Fiber optic cables made from just 60 pounds of sand can carry many times more information than old-fashioned cables made from 2,000 pounds of copper.  And even the skyscrapers towering our cities now require 35% less steel than the same buildings would have used just 20 years ago.