I was just cleaning off my desk at work and had these statistics about local food written down on a piece of scrap paper I really must throw away.
-A meal grown more than 50 miles away takes 17 times more energy to produce than the same meal grown within 50 miles.
-20% of our nation's fossil fuels is used on food production.
-1 calorie of food takes 10 calories of energy to produce.
If you are curious about the validity of these facts (as you probably should be knowing my note taking skills) listen to this episode of Talk of the Nation. It is really interesting and about an hour long if memory serves.