A Switzerland itinerary is not complete without taking a few days to explore it’s largest city.  Zurich is frequently ranked as one of the world’s most livable places.  In addition, it’s often an example of a sustainable city. What makes a city sustainable?  There are three things to look at when seeing a city’s potential.  Environment, economy and social impacts are the three indicators used to determine how eco-friendly a place is.  That means the city is active in being as green as possible, viable, safe and responsible.  It’s nice to know you can plan vacations in urban areas and still try to make ethical travel choices.  You can easily…