Crates filled to the brim with watermelon rinds, bushy pineapple tops, lettuce scraps and grass clippings each weigh in at nearly a ton. One might be inclined to call this "organic waste." But not Clean World Partners: This is biodigester food. It's feeding day for the four huge cylindrical tanks of the biodigester on the grounds of the American River Packaging plant in North Natomas. Nearly 10 tons of leftover plant matter are being dumped into the ...