Despite efforts to raise awareness of the challenges of sustainable development and environmental issues, such as depleting oil reserves, toxic waste, climate change and water shortages, individual behaviour has been slow to change. The proposed study explores the efficacy of an innovative bottom-up social marketing approach to encourage pro-environmental behaviour (PEB) using hairdressers as 'catalytic individuals' to diffuse knowledge and practices relating to responsible chemical, energy and water use across their social networks. Hairdressers use a lot of energy, water and chemicals, but our research last year (Baden, 2010) indicated that, despite the increased concerns and public pronouncements on the importance of sustainability, little awareness has filtered into the hairdressing sector. This lack of attention to environmental issues by hairdressers then constitutes a social norm that is antagonistic to sustainability awareness, especially hair-washing, drying and colouring, which are activities that are also carried out at home. Thus the study aims to engage hairdressers, both in developing their own PEBs, and as 'catalytic individuals' to help perpetrate more pro-environmental social norms across their social networks. The proposed study will be in the form of action research: Action: Selected hairdressers will be interviewed to assess their current sustainability practices and extent to which they provide a model of PEBs (e.g. reduced toxicity of hair products, water conservation, low use of energy in terms of drying and style) either through their practices or through their conversations with customers. Our pilot research found zero examples of such environmental awareness, but a willingness to engage with the topic further. Twenty five hairdressers will then be invited to an event to raise awareness of environmental issues in their work and encouraged to come up with their own ideas to reduce environmental impacts. We plan to create positive attitudes towards the project by making the event fun, with good refreshments and inspirational speakers, and offering free samples of eco-friendly products. A follow up event will be held four months later to share what worked and what didn't and engage the hairdressers in developing best practice benchmarks for their industry, and to enable them to attain the Steps Towards Environmental Management (STEM) certification. We plan to hold two events and two follow-up events, with a total sample size of 50 hairdressers. The research part of the action research will look at how hairdressers can be used to disseminate information about PEBs to the general public. Social networking theory proposes that information is best disseminated by weak ties (Granovetter, 1973). Diffusion of Innovations theory explores social networks and their role in influencing the spread of new ideas and practices. Of all occupations, hairdressers spend the most time generally chatting to a wide variety of people and comprise a weak tie for many. The research plans to explore the extent to which hairdressers involved in the development of environmental benchmarks talk to their customers and other colleagues about sustainability and act as a diffuser of information and practice on PEBs in areas related to the use of water, electricity and chemicals. This is a cross disciplinary proposal which brings some of the theoretical insights from the disparate areas of network modeling (social network theory, diffusion theory); social psychology (e.g. self-determination theory, social learning theory, social norms) and marketing (word of mouth marketing, social marketing, catalytic individuals) and sustainability management together in one project that has real potential, both to transform a particular sector, and to test the efficacy of developing a more innovative and bottom-up approach to social marketing to address our urgent need for a transition to a low carbon economy.