The stench from the sewage sludge Bob Guenther’s neighbor used to fertilize crops was so strong that a county commissioner called out to look at the property ran to a nearby ditch to vomit.

What started as annoyance for the Washington state tree farmer became alarming when Guenther’s wife developed chronic bronchitis. It’s like clockwork, he says: Every time the sludge is spread, his wife’s health goes downhill. Read more