Hannah Ritchie is a Scottish data scientist and senior researcher at the University of Oxford, where she leads research at Our World in Data. She is an expert on sustainability and environmental change, using data to challenge misconceptions about the state of our planet. Her work focuses on making complex environmental issues accessible through clear analysis and evidence-based insights. Ritchie is the author of "Not the End of the World" and "Clearing the Air", where she presents an optimistic yet realistic perspective on solving global environmental challenges. Her research reaches millions worldwide, helping to inform public understanding of climate change and sustainability.