OILDALE, CA - AUGUST 10: Oil wells are among the thousands pumping the oil fields of California's southern Central Valley on August 10, 2004 in the town of Oildale, California. California?s Central Valley is one of the nation's most important agricultural and oil producing areas. Mass food production has brought heavy use of chemicals, including pesticides that have sickened hundreds of area workers and residents. In 2002, the last year for which numbers are available, 172 million pounds of pesticides were used on California fields sickening 478 people as airborne chemicals drifted 39 times, according to the state Department of Pesticide Regulation. On May 2, a crew of 100 workers was caught in a drift of pesticide near Arvin that made 19 of them sick, including a woman who was five months pregnant. This spring, state Sen. Dean Florez introduced a bill, the Pesticide Drift Exposure Response Act, to help pay for field workers' medical care. (Photo by David McNew/Getty Images)