From the San Francisco Chronicle today comes a great story about how major produce buyers are imposing secret scorched-earth measures on hundreds of thousands of acres where spinach and leafy greens are grown. Trees are being bulldozed, frogs and rodents are being killed, and farmers are creating wide crop buffers of bare dirt, all in a misguided attempt to prevent another outbreak of E. Coli. The changes are taking a heavy toll on the Salinas Valley, the nation's "salad bowl," which is incredibly biodiverse and traditionally a hotbed of sustainable agriculture. By eliminating the natural checks and balances on the agricultural ecosystem, the measures might be doing more harm than good. There has never been an E. Coli outbreak on small-scale farms---farms that are integrated with the local ecosystem and sell to the region's farmers markets.