One word binds us all: geography. We are all geographers, human beings who care about the places we think of as ‘home’ – our habitat.

Nicholas Crane makes the compelling case to Julia Wheeler that geography has never been so important. On this finite orb, with its battered habitat, sustained in dark space by a thin, life-giving atmosphere, we have reached a point in our collective geographical journey where knowledge is the best guarantor of the future.