Hannah Daly is Professor of Sustainable Energy at University College Cork, where she co-leads the Energy Policy and Modelling Group. Her research focuses on modelling national and global decarbonisation pathways, with particular expertise in energy systems, carbon budgets, and climate policy. She is Principal Investigator of multi-million-euro research projects, serves as the founding Programme Director of UCC’s new BSc Sustainability, and has served as a lead author of Ireland’s Climate Change Assessment.Before joining UCC, Hannah worked at the International Energy Agency in Paris, leading the World Energy Outlook work on energy access and sustainable development. She is a recognised public voice on climate and energy, writing a monthly column for The Irish Times, and frequently advises government, parliament, civil society, and international organisations.She was born when atmospheric CO2 concentrations were 351 parts per million; they now stand at nearly 430 parts per million.