Pinning down the pesticides
California’s Central Valley — 20,000 square miles of lowland ringed by mountains — produces a quarter of the nation’s food. But this abundance comes with environmental consequences: there are so many chemicals sprayed across the valley’s croplands that the region’s waters are often tainted.
That’s a broad statement, and for now, it has to be. The pesticide problem is so complex that it’s hard to even know the extent of the damage.