California has long led the US in tackling air emissions, but Congress recently voted to block a key tool employed by the state to accomplish its goals. In this episode of ESG Currents, BI senior ESG analysts Gail Glazerman and Rob Du Boff are joined by Mary Nichols, distinguished counsel for the Emmett Institute on Climate Change and the Environment at UCLA, who previously served as chair of the California Air Resources Board. They discuss implications of the auto-emissions waiver repeal, ways the state could still push emissions improvements and how companies may respond to the rollback in federal ambitions. This episode was recorded on June 5.