What is the circular economy? Who's doing it? And what are some of the best examples of it in action? In part one of our what is the circular economycircular economyA systems solution framework that tackles global challenges like climate change, biodiversity loss, waste, and pollution. It is based on three principles, driven by design: eliminate waste and pollution, circulate products and materials (at their highest value), and regenerate nature. series, Joe Iles and Ellen MacArthur consider what this idea might mean for cars, packaging and sandwiches.