This study examines communication about global warming with an emphasis on encouraging a change in a viewers behavior, and how this can be practically visualised on websites. The study first gathers research from the fields of climate change communication, marketing and psychology, then a survey is sent out and an overview of websites about global warming is made. The findings from all this is then applied to a Hi-fi prototype of a website. The study aims to answer the question: How could visualized messages and information about global warming encourage change in a viewer’s behavior? User tests of the finished prototype gave mixed results. The results suggest that the site succeeded in creating a positive tone and emotional impact, but were not as successful at encouraging change and raising perceived self-efficacy. It may have been successful at encouraging hopefulness, and informing, but it is a bit unclear due to contradicting results from quantitative personal ratings and qualitative interview answers. / <p>Examensarbetet är utfört vid Institutionen för teknik och naturvetenskap (ITN) vid Tekniska fakulteten, Linköpings universitet</p>