L.A. city officials and environmentalists say the closure of the L.A. County landfill in Puenta Hills, the nation's largest, marks a shift in future of waste management across the country.
You may have seen Puente Hills while driving the 60 freeway east of Los Angeles. It looks like a 700-acre, 450-foot high, tree-covered mountain. However, no mountain was there in 1957, when the facility opened. It’s made of seven decades of Southern California’s waste.