For several decades, international donors, researchers, and grassroots organizations have tried to address the health and environmental effects of cooking and heating with woodfuel, charcoal, and other solid fuels, but success has been elusive, so financing transitions to clean and efficient cooking has been a major challenge. Monetized climate benefits such as carbon offsets have the potential to bring outside investment to clean and efficient cooking interventions, which reduce emissions by reducing or displacing nonrenewable biomass . A key parameter—the fraction of nonrenewable biomass (fNRB)—is required to estimate the magnitude of offsets.