Mark Hayden is a consultant paediatrician from London. He trained and worked in the UK and Australia. He is therefore working to make reparation for the carbon emissions this lifestyle entailed. Having stopped using aeroplanes in 2018, he has discovered the joy of cycling and will return “home” to Australia one day on his bike. Using the narrative of cycling as a journey of discovery and collaboration he campaigns as part of Ride For Their Lives for urgent climate action, focussing on air pollution, active travel and a just transition from fossil fuel.