Contributor(s): Dr Ann Pettifor | To protect the systems that sustain life on earth, we need to do more than just reimagine the economy – we have to change everything. From one of the original thinkers of the program that helped ignite the US Green New Deal campaign, Ann Pettifor explains how we can afford what we can do. We have done it before – and can do it again. Ann Pettifor (@AnnPettifor) is the Director of Prime, an Honorary Research Fellow at City University, a Research Associate at SOAS and a Fellow of the New Economics Foundation. Her new book is The Case for the Green New Deal. To pre-order a copy of the book, which can be collected from independent bookshop Pages of Hackney at the event, please go to The Case for the Green New Deal. Sam Fankhauser is Director of the Grantham Research Institute on Climate Change and the Environment. The Grantham Research Institute on Climate Change and the Environment (@GRI_LSE) was established by the London School of Economics and Political Science in 2008 to create a world-leading centre for policy-relevant research and training on climate change and the environment, bringing together international expertise on economics, finance, geography, the environment, international development and political economy. Twitter Hashtag for this event: #LSEPettifor This event forms part of the “Shape the World” series, held in the run up to the LSE Festival, a week-long series of events taking place from Monday 2 to Saturday 7 March 2020, free to attend and open to all, exploring how social sciences can make the world a better place. The full programme will be available online from January 2020.