Economic growth has resulted in a twin crisis of climate change and environmental breakdown, while millions still live in poverty, a third crisis. Is it possible to resolve all three, or are there trade-offs? Can the crises be tackled by environmental and social policies within the logic of the existing economic system, or is a new paradigm required that rejects GDP growth as an objective?This debate brings together two discussants in three rounds of conversation, to propose, test, and challenge each other's ideas.