This Dagstuhl Perspectives Workshop aims to provide a forum for world-leading computer scientists and expert consultants on environmental policy and sustainable transition to engage in a critical and urgent conversation about computing’s responsibilities in addressing climate change. The workshop will consider the positive and negative climate impacts of a range branches of computing, including (but not limited to): AI and Machine Learning; Software and Mechanical Engineering; Internet Architectures; Large-scale, Distributed, and Cloud-based systems; Environmental Data Science and Climate Modelling; ICT Environmental Assessment and Energy-Aware Computing; Smart Cities, Smart Grid, and Transition Engineering; Safety and Security; and Human-Computer Interaction and ICT for Sustainability.