Two further book chapters: 1) 'Jevons' Paradox' in Degrowth: A Vocabulary for a New Era (Routledge, 2015), edited by Giacomo D'Alisa, Federico Demaria and Giorgos Kallis, pp 121-24. 2) 'Population Matters' in Sustainability: Key Issues (Earthscan/Routledge, 2015), edited by Helen Kopnina and Eleanor Shoreman-Ouimet.