Mark Bittman, the New York Times food writer, has a good essay about why to eat local. I’m reccomending it. http://opinionator.blogs.nytimes.com/2011/11/01/local-food-no-elitist-plot/?ref=opinion.
I try to get most of my product locally, and I always credit a local producers in the ingrediants lists. I’m irritated that nobody makes good local organic sugar, even tho sugar beets grow in the Northwest. But I’d rather have some nice jam from a local berry bush, or apple tree, then a fancy-pants jar from France or Denmark.