Winners
| 2020-2022 | Clean Cooking: Why is Adoption Slow Despite Large Health and Environmental Benefits? | Govinda R. Timilsina Sunil Malla |
| 2017-2020 | Measuring Energy Efficiency: Accounting for the Hidden Cost of Product Failure | Art Fraas Sofie Miller |
| 2012-2016 | The Green Paradox of U.S. Biofuel Subsidies: Impact on Greenhouse Gas Emissions | Maura Allaire Stephen P. A. Brown |