While the realities of climate change are not always visible, the realisation that our grandchildren will live in troubled times can catalyse action. After becoming a grandmother, former Irish president and UN High Commissioner for Human Rights, Mary Robinson travelled the world to learn about the fight back. In her book Climate Justice, she describes the people working to overcome the threat. In a live event at the Edinburgh International Book Festival 2019 she shares her hopeful account in conversation with Ruth Wishart.