Imagine if most of your calories came from vegetables?
It is important to know whats in season and what is locally grown in your area. My favorite for the United States area is http://www.localharvest.org/ for those who live internationally http://www.openair.org/view/marketmagazine gives a pretty good view of where to find a local farmers market. When purchasing local produce know its less damaged, less preservatives as the farmer does not need to preserve it to ship and it supports your local economy!
Check out your local farmers markets and don't forget to wash your veggies and fruits!