Studies show that most groceries travel about 1,500 miles from the farm to store shelves. The same distance covered by your average car (one that gets about 30 miles per gallon) pumps out about 1,200 pounds of CO2, according to this math. Most commodities arrive in bulk on the back of a flatbed, so the impact is likely even greater.
Follow the link and check out the charts that will help you decide what kind of PIE you’ll want to be eating based on where you are (e.g. pecan pie is the thing, here in Texas where pecans are plentiful). You’re not going to save the world by choosing one pie over another, but it’s worth thinking about the true cost of the food on your table.