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Sorry mate, but it is pretty obvious that if your are taking the trouble to actually stay organic, then it should be a safe bet that you would be buying local anyway. As you should realize, the longer the distance for a product to travel, the more chance that that product would have leaked more nutrients on the long journey to its final destination.
The point seems to be lost in the fact that everyone is commenting on how much emissions is caused by a 2,000 mile well traveled cucumber and not the fact that you would have to consume maybe up to 20% more of that cucumber to get the same nutrients as a locally grown one. Can you see where I am going with this. The big message is, shop local and in season. There are enough recipes both good, bad & outrageous out there for you not to be having to buy out of season produce. Who on earth came up with the great idea that it was natural to eat a strawberry in December anyway.
With all this talk of actually staying organic, shouldn't it be a further topic to see how many people would actually try to supplement their weekly shopping with home grown veg. You must admit, it does taste a whole lot better than store bought produce; and you have the added satisfaction of gloating to the world and his wife that you not only cooked that great tomato sauce from scratch, but you also grew most of the ingredients on your small balcony too boot.
My mother at an early age gave me this advise; "Cooking is 10% knowledge and 90% common sense". In my opinion, this practice should also be used when purchasing produce as well. Use your head, as you and your loved ones will be digesting the culinary masterpieces that you have slaved over in that hot & humid home chefs' kitchen.