Most people spend very little time talking about environmental issues with their colleagues, friends and family members. Yet research shows that these are exactly the conversations we need to be having in order to promote greater public engagement with the climate change and sustainability challenges we face. In this talk, I will present some of the research we and others have done on the key role of interpersonal communication—everyday social interactions and conversations—in climate change decisions. I will then highlight how this work can be used to support pro-environmental decision-making across a variety of issues. This will be a moderated conversation with lots of time for Q&A.