French President Emmanuel Macron is hosting foreign leaders in Paris for a summit focused on how to help the world's poorest countries deal with increasingly catastrophic events linked to climate change, without being saddled with huge debts. The big focus is on reform of the decades-old Bretton Woods institutions: the World Bank and the IMF. One of the key attendees at the summit is Laurence Tubiana, one of the architects of the 2015 Paris Climate Agreement. She joined us for Perspective.