The theme of this series is pursuing the frontiers of sustainability by unlocking change. So much of making a successful transition to a more sustainable future (which is by no means certain) depends on letting go. In the episodes that follow, we will explore how we must find ways to let go of an industrial system that has served us well, but is no longer fit for purpose. We will need to let go of old styles of leadership and out-dated models of business, high-impact lifestyles and selfish values. We must learn to let go of cherished ideologies that are causing destruction and beliefs about ways to tackle problems that are failing to resolve crises.