Climate change is one of the the world's biggest challenges. How media report about it has a big affect on how people interpret it and if government take action. Sources has a big importance for all journalism that is produced. Does the journalist or the source control what is reported about climate change, what does their relationship look like and how does that affect the result of the reporting? This is a study about the relationship between environmental journalists and their sources. We investigate in what way they are dependent on each other and who or what controls the reporting about climate change in Swedish Public Service. We are analyzing this by doing a case study of two climate journalists, one from Public Service Television (SVT) and one from Public Service Radio (SR). We are interviewing them and their sources to find the sources approach towards environmental journalist and vice versa. We also analyze if the journalist, the source or the circumstances controls the reporting and set the agenda about climate change. Our study shows that environmental sources have a positive attitude towards environmental journalists and that they find knowledge as a highly valued quality. Furthermore it shows that both the journalists and the sources actively works to initiate what is brought up in media. Sources write press releases, debate articles, tweet their work and contact journalists but in most cases it is the journalist who initiates contact with the source. In our study it becomes clear that environmental sources and environmental journalist depend on each other and have a dynamic relationship.