Haydn is an environmental scientist and writer and activist with a 40-year history in environmental science. He also writes extensively on ecological economics and ecological ethics. He is an Adjunct Lecturer in the PANGEA Research Centre, BEES, UNSW. His books include ‘Climate Change Denial: Heads in the Sand’ (2011 with John Cook), ‘Human Dependence on Nature’ (2013), ‘Demystifying Sustainability’ (2015) and ‘A Sense of Wonder Towards Nature’ (2018). Haydn is Co-Director of the NSW Chapter of the Centre for the Advancement of a Steady State Economy, and is on the Advisory Board of the journals ‘Ecological Citizen’ and ‘Sustainability’. He is also on the Steering Committee of the new group ‘GENIE’ (www.ecodemocracy.net).