What is the Green New Deal and how can we afford it? To protect the future of life on earth, we need to do more than just reimagine the economy—we have to change everything. One of the seminal thinkers of the program that helped ignite the US Green New Deal campaign, Ann Pettifor explains how we can afford what we can do, and what we need to do, before it is too late. The Case for the Green New Deal argues that economic change is wholly possible, based on the understanding that finance, the economy and the ecosystem are all tightly bound together. The GND demands total decarbonization and a commitment to an economy based on fairness and social justice. It proposes a radical new understanding of the international monetary system. Pettifor offers a roadmap for financial reform both nationally and globally, taking the economy back from the 1%. This is a radical, urgent manifesto that we must act on now.