Since Chicago is surrounced by farmland, you'd think it would be easy to eat local, seasonal produce, but there are few grocers and restaraunts that focus on keeping it local. Chef's Collaborative has a mission of encouraging local, seasonal, and sustainable produce purchases by restaraunts. Their Illinois list is small and I think incomplete. But they explain how to choose sustainable fish and seafood, why grass-fed vs. grain-fed isn't the only factor in getting quality meat, and they have a list of suggestions from farmers to chefs to increase the quality of their menu. Even though the website is directed at chefs and restaraunt owners, it helps to stay informed about what you're putting in your body. The Audubon Society also has a wallet card you can print and carry with you to ensure you aren't eating endangered seafood.