I read somewhere, or heard about a lecture, I forget which, in which the author / lecturer maintained that in a few years' time, everything we ate would be organic because ultimately everything else is unsustainable, depending as most of our food does on large quantities of fossil fuel for fertilisers and transport. I think he was assuming, totally wrongly in my view, that the peak oil / climate change / credit crunch / general governmental incompetence causing the current crisis would suddenly lead to a more equitable distribution of resources and that millions won't just starve because of our cockeyed and corrupt system.
When I'm shopping, I tend to go for low air miles as an admittedly crude indicator of the worthiness of something. I always avoid buying Israeli stuff, but for something like dates, the alternatives are not necessarily a lot better. Yesterday I didn't buy apples because they came from New Zealand or South Africa, but did buy pears from the Netherlands, which for all I know were grown in heated glass houses and were therefore less environmentally sound that SA apples. I did buy SA satsumas. "Organic" doesn't really figure on my radar.