A TED Talk, featuring Nobel Prize-winning economist Esther Duflo, who brings a data-driven precision to the climate crisis. She says that while world leaders haggle over finances at endless summits, rising temperatures will kill millions in the poorest countries by the end of this century. She calculates the cost of wealthy nations pumping greenhouse gases into the atmosphere and argues that getting billionaires to pay their fair share in taxes is the best way to cover these damages. Watch now.