We'd probably like to think that clean, safe food goes hand in hand with pristine nature, with lots of wildlife and clean water. But in the part of California that grows a lot of the country's lettuce and spinach, these two goals have come into conflict.
Environmental advocates say a single-minded focus on food safety has forced growers of salad greens to strip vegetation from around their fields, harming wildlife and polluting streams and rivers.
The heart of this conflict is the Salinas Valley, on California's central coast. And my guide to the valley, on this beautiful spring day, is Daniel Mountjoy, an ecologist with a nonprofit organization called Sustainable Conservation. "I just love the drive down through here," Mountjoy says, as we head southeast from Castroville, the self-proclaimed "Artichoke Center of the World."