In this paper I introduce the concept of eco-masculinities as a philosophical and critical project to understand the links between gendered and pro-environmental behaviour. The background of the feminist project, the sociology of masculinity, and the post-gendered world to which they both aspire, alongside a brief history of the project of ecofeminism, occupy the bulk of the paper. In the last section I briefly consider how these philosophical approaches might impact upon analysis of an EU Project entitled Digital Environment Home Energy Management System.