Achieving a socially and environmentally sustainable mobility and transport system necessitates a multifaceted approach that considers just Earth System Boundaries. Just Earth System Boundaries are domain-specific (e.g. climate change, water) thresholds beyond which significant harm is done to people and other species. We have crossed these thresholds in 7/8 domains and not yet met the minimum needs of people worldwide. The challenge is to return to the safe and just corridor while prioritising the access of the poorest people to minimum resources as called for by the principle of leaving no one behind. Within this context, the transport sector, a major contributor to climate change and environmental pollution, requires significant and swift transformations. This comment proposes six key principles for building a sustainable transport system: prioritising equitable access, enhancing public transport and limiting private transport, decarbonising fuel and fleets, decoupling freight transport from fossil fuel trade, repurposing infrastructure, and ensuring just financing. These principles may enable just living within just Earth System Boundaries.

The transition to electric mobility is a cornerstone of global efforts to reduce carbon emissions and enhance energy efficiency. This editorial explores the critical role of integrating electric mobility systems with power grids to ensure sustainable transport solutions. Drawing from research presented in this special collection, we analyze key challenges in optimizing charging infrastructure, managing vehicle-to-grid (V2G) interactions, ensuring equity in energy access, and strengthening governance frameworks. The findings emphasize the importance of interdisciplinary solutions that align technological innovation with policy measures to build a resilient and sustainable transport-energy nexus.