It may sound like a load of, well, sewage, but according to this San Francisco Chronicle story, a new wastewater treatment plant that will use wetlands to remove nutrients, heavy metals, and pathogens will allow residents of Petaluma, CA, to actually help local wildlife by flushing their toilets. The new facility will include 221 acres of marsh that will provide habitat for wildlife. There will also be a hiking trail through the sewage-filled wetlands, which begs the question: Is that a walk you’d want to go on?