delivers a new bucket and takes away one that’s full of waste from a family’s composting toilet. He’ll deliver the solid waste to a site in the nearby town of Limonade, where it will be ...

Many years ago, I wrote a feature for New Scientist about an innovation in waste-water treatment called urine-separation toilets, which, at the time, looked like becoming a desirable accessory for ...

You’ve probably noticed it a hundred times but never really thought about it– those two buttons on your toilet flush. One small, one big. You press whichever feels right in the moment, without ...