Driving Sustainability in the United States: Efficacy of State-Level Biodiesel Policy Approaches.

The United States has significant greenhouse gas and criteria pollutant emissions that lead to global warming, human health, ozone, and smog issues, partially attributed to its diesel-consuming transport fleet. Until fleet electrification reaches cost parity with internal combustion engines, biodiesel use can reduce these negative impacts. In this study, we analyzed and categorized the biodiesel-supporting policies of each U.S. state using manual inductive coding to compare them against state-level biodiesel consumption and production. Through statistical modeling, we determined the efficacy of these policy approaches. The policy analysis identified that biodiesel policies that support infrastructure development and biodiesel production correlate significantly with increased biodiesel consumption at the state level. We also show that a combination of these policy categories correlates significantly with overall higher biodiesel consumption. Our methodological approach and policy analysis findings reveal valuable insight into the efficacy and outcomes from existing biofuel policies in the United States.