What goes down your toilet and drain can end up on farm fields across the United States. Biosolids, or sewage sludge, are the ...

But several years ago, her neighbor began applying sewage sludge, which consists largely of human waste left over from municipal wastewater treatment facilities, as a fertilizer on his farmland ...

SEATTLE — Farmers across Washington already spread thousands of tons of fertilizer from human waste on their crops each year, but there's a major blind spot when it comes to potential contaminants.

They collect food waste donations to feed hens, which in turn provide natural fertilizer for olive trees producing oil high in inflammation-busting polyphenols. "We provide them with an old hens ...