Nail polish, batteries, hand sanitizer: You may not think of these regular household items as toxic, but they are, and they’re poisoning our water and food supplies.
Update: California Central Coast row-crop farmers are now required to test their private wells for nitrate, a widespread groundwater contaminant linked to over-fertilization.
Grace S. Brush, the foremost ecological historian of Chesapeake Bay, America's largest estuary, examines the historical connections between land use, nitrogen and coastal dead zones.