Over the last decade, Americans’ awareness of and sensitivity to the environment has grown dramatically, and environmental concerns regularly top opinion polls as being important.  Going hand-in-hand with this awareness is a desire to purchase products that are green, such as those that are organic, natural or have an environmentally friendly benefit. Retailers, food and consumer product manufacturers have sought to capitalize on this trend by launching new lines of products touting their natural qualities. The Natural Marketing Institute estimates that the size of the green marketplace will reach $420 …