Human transportation has a significant impact on carbon dioxide emissions. Recently several industries have focused on producing more sustainable transportation technologies. However, exploiting the emerging benefit of such technologies requires behavioral changes to integrate decisions and behaviors towards sustainable mobility in users’ everyday lives. In this workshop, we invite designers, researchers, and practitioners from the sustainable HCI, persuasive design, AutomotiveUI, and mobility communities to collaborate in finding ways to make future mobility more sustainable. Using embodied design improvisation and design fiction methods, we will explore the ways that systems affect behavior which then affect the environment.