I've read about this before - eating foods that are organic and local.
Now some details.
http://www.prwatch.org/news/2014/01/12365/local-organic-and-fair
And health aside here's the best reason to invest the time in find local organic farmers for one's food -
"Farming with organic methods can also help significantly in reducing global warming. According to research at the Rodale Institute, if organic methods were applied to all of the world's cropland, it would be the equivalent of taking 1.5 billion cars off the roads -- 39 percent of the world's carbon would be sequestered in the soil! By using cover crops, composting, rotating, and mulching, organic farms can sequester 1,000 lb of carbon per acre per year. Building organic matter buffers soils -- in extreme conditions of drought and flooding, organic farms are more resilient and out yield farms using synthetic fertilizers. Pimentel's research shows that on average, organic farms use 30 percent less energy than conventional farms by avoiding synthetic nitrogen fertilizers and focusing on recycling nutrients. The production of synthetic nitrogen fertilizers is especially energy-intensive. Evidence is surfacing that as much as 4 or even 5 percent of nitrogen fertilizer turns into nitrous oxide, a greenhouse gas 300 times more potent than carbon dioxide."
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