This is from an op-ed piece in Sunday's NY Times:
Most mass-produced coffee is grown in open fields heavily treated with fertilizers, herbicides, fungicides and insecticides. In contrast, traditional small coffee farmers grow their beans under a canopy of tropical trees, which provide shade and essential nitrogen, and fertilize their soil naturally with leaf litter. Their organic, fair-trade coffee is now available in many coffee shops and supermarkets, and it is recommended by the Audubon Society, the American Bird Conservancy and the Smithsonian Migratory Bird Center.And then there's this, posted last week on Grist:Organic bananas should also be on your list. Bananas are typically grown with one of the highest pesticide loads of any tropical crop. Although bananas present little risk of pesticide ingestion to the consumer, the environment where they are grown is heavily contaminated.
When it comes to nontraditional Latin American crops like melons, green beans, tomatoes, bell peppers and strawberries, it can be difficult to find any that are organically grown. We should buy these foods only if they are not imported from Latin America.
Overall, the nutritional value of conventional veggies has been falling for decades. As farmers (and their input suppliers and extension agents) have worked to maximize yield, food has become significantly less nutritionally dense. In a survey of veggie crops, for example, riboflavin levels dropped nearly 40 percent between 1950 and 1999. (For more info on this, see an earlier Organic Center report called "Still No Free Lunch: Nutrient Levels in the U.S. Food Supply Eroded in Pursuit of Higher Yields.")
The protein content of conventional U.S-grown corn and soybeans has plunged in recent years -- likely due to yield-boosting mania and the near-universal use of genetically modified seeds for those crops.