In this photo taken Wednesday June 1, 2011, a cow walks near oil pump jacks in Santa Maria, Calif., Wednesday, June 1, 2011. In a place where oil exploration long co-existed with agriculture, a three-story contraption humming day and night in the heart of Santa Barbara wine country struck residents as a mere curiosity until someone uttered the petroleum industry's dirty word: fracking. (AP Photo/Jae C. Hong)