examine San Fransisco, Chicago in depth and gauge their implementation of environmental, cultural and economic principles of sustainable tourism. Final analysis should include any revelations of how the destinations operate and do or do not apply principles of sustainability in their efforts. Remember, focus on the principles of sustainability instead of the term "sustainable tourism."Minimum seven (7) sources required.  A maximum of two (2) sources can be the tourism office/chamber/city etc. website representing each location.  Scholarly (textbooks or peer reviewed articles) strongly suggested.