I buy free-range meat wherever possible for animal welfare reasons and possible eco benefits too. I buy organic milk because I think it's better for you - I suspect it's more eco friendly to produce with cows eating grass and whatnot but I am not sure, haven't looked into it enough
I also try and minimize food miles - I used to love Anchor mature cheddar but no way I am having my cheese shipped in from New Zealand when I can get just as delicious cheddar from 20 miles up the road - in Asda and Tesco. Actually, much as I hate Asda in general they are (or ours is) pretty good at sourcing local food. They even have free range eggs from a small farm about 5 miles down the road when they can get them.
I also try to shop in-season too.
I think there are bigger issus to deal with before we start asking ourselves "is the world going to end in a fireball because of where I buy my coffee from"
That's not really the point. There are basically millions of small 'issues', some are easy to fix and some are not. Don't eat strawberries in January - that's not hard. Grow a pot plant instead of buying cut flowers all year - also not hard. It's not going to save the world if you just do those things, but if everyone did what they could, it'd go quite a long way (no pun intended).
Or to put it another way - every little helps