Thuy Pham’s Reviews > The Big Necessity: The Unmentionable World of Human Waste and Why It Matters > Status Update

“In Mrs. Tien’s kitchen, I am given what will be the first of many biogas demonstrations. They generally proceed like this: switch on the biogas. Sniff. Express pleasure that it smells only faintly sulphuric. Light the gas. Express more pleasure. Switch on the light... Mrs. Tien seems genuinely excited to demonstrate her free gas, though I get the sense she’s done it before.”