The conclusions are that the production of orange juice has a bigger impact/cost more than the transportation of it. In that case, you should be drinking the stuff that tastes best. Refreshing!
In the end, not-from-concentrate orange juice sold by the carton comes out slightly ahead of frozen OJ sold by the canister in terms of energy use. As a green consumer, your worst choice would be to buy juice that's been rehydrated by the supplier, then placed in cartons (such as Minute Maid Original). If you prefer juice from concentrate, whether for the lower price or more Tang-y taste, it's better to rehydrate it yourself.
What about squeezing your own OJ? Keep in mind that, unless you live in Florida or California (the nation's No. 2 orange producer), chances are those Valencias traveled a long, long way to get to your grocery aisle. And transporting enough oranges to yield six servings of juice requires nine times more cardboard waste than transporting a 12-ounce canister of FCOJ.The juice industry also claims that its manufacturing process is much more efficient than drinking squeeze-your-own, since factories waste no part of the orange: The rinds are turned into cattle feed, the oils into food flavorings.
I buy frozen orange juice because it has less of an impact- on my arms when I'm trying to cart it home from the store on the bus.
At the end of the day I wouldn't be sweating my orange juice consumption unless I was drinking a gallon a day. It's fine to consider the eco-impact of everything you use, but when you start stressing about it you've gone too far.