A quote from Ken Pinare really hit home with me as well:
When you buy organic you are more assured of what is in your food (or rather, what is not) and where it is coming from. You are paying for transparency and security, which makes up for the elevated cost. This reminds me of the quote, from Food Inc I believe, "You can pay a little extra for your food now, or pay the doctor later."
image from http://www.saywhatyouneedtosayblog.com/2012/09/24/local-vs-organic-what-to-buy/
In terms of sustainability and curbing global warming, organic farming is crucial. With organic farming the amount of GHG would decrease since the biggest part of fossil fuel usage is associated with chemicals (Sustainable Table). Converting conventional farms to organic farms will not only decrease GHG in the atmosphere but will also rejuvenate the earth and soil to its natural state, helping all cycles of the ecosystem. Organic farming aids carbon sequestration making them a carbon "sink", prevents dangerous run-off, etc. (Rodale Institute).
I still feel that buying produce from farmers market is the way to go, as the majority of these farmers are producing their food organically yet simply cannot afford the cost of certification. I will continue to be more vigilant as I walk the isles of my supermarket.
Sustainable Table. (2009, January) What is local? Retrieved from: http://www.sustainabletable.org/issues/eatlocal/