Zero Altitude follows Helen Coffey as she journeys as far as she can in the course of her job as a top travel journalist – all without getting on a single flight. Between trips by train, car, boat and bike, she meets climate experts and activists at the forefront of the burgeoning flight-free movement. Over the course of her travels, she discovers that keeping both feet on the ground is not only possible but that it can be an exhilarating opportunity for adventure.