New technologies allow perfect detection of environmental violations at near-zero marginal cost, but take-up is low. We conducted a field experiment to evaluate enforcement of water conservation rules with smart meters in Fresno, CA. Households were randomly assigned combinations of enforcement...

Safe drinking water is essential for healthy human development and survival, but millions of poor people in low-income countries only have access to contaminated drinking water. For children, the problem is particularly dangerous and deadly, with diarrheal diseases like typhoid and cholera...

Thanks to modern chemistry, we are able to locate heaps of chemical compounds in water, even at extraordinarily low concentrations. Majority of techniques for compound analysis require state-of-the artwork lab facilities. Fortunately, we don’t have to check for everything! A smaller and extra...