In this article the authors focus on the centrality of human behaviour in the response to climate change. They claim that, since much environmentally-related behaviour is stable and persistent, to understand (and change) behaviour we must focus on the habits and routines that make up everyday life. Two ways of understanding ingrained behaviour are explored; the social psychological perspective and the social practice tradition. With these different understandings the authors finish the article with practical implications for promoting environmentally sustainable societies.