Iceland Foods is a £3bn business that is affecting real change in the supermarket. From restricting single-use plastic to eradicating palm oil from products, MD Walker's aim is to find purpose with profit for his business. He explains how we can all make genuine progress on sustainable initiatives while being realistic about profit margins, and our obligations to customers and employees.

Canadian journalist MacKinnon asks, what would really happen if we simply stopped shopping? Is there a way to reduce our consumption without triggering economic collapse? This question took him around the world, seeking answers from America’s big-box stores, the hunter-gatherer cultures of Namibia, and communities in Ecuador that consume at a sustainable level. When Covid brought shopping to a halt, his ideas were tested in real time. Drawing from experts in fields ranging from climate change to economics, MacKinnon investigates how living with less would change our planet, our society, and ourselves. And along the way, we have so much to gain.

Lucy Siegle is an author, broadcaster and writer on environmental issues.