In this undated photo, debris pile up in front of a home construction site in Minneapolis. For decades in Minnesota, landfills for construction and demolition debris have not been required to use linings that stop toxic pollutants from seeping into groundwater. As the Minnesota Pollution Control Agency tells it, the waste wasn't considered to be an environmental risk when the landfill rules were first implemented in 1988. (Bill Kelley, MinnPost via AP)
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