Marketplace: KAI RYSSDAL: Goodness knows you’ve heard the word a lot on this program. You’ve probably used it yourself at some point in the past couple of years: Sustainability. Companies have caught on too. A lot of them have launched what they call sustainability initiatives — doing well by being good. That usually means cutting energy and water use and waste. They’ve hired sustainability directors, carefully calculated their carbon footprints, and banished styrofoam from the …