Some advice on your essay/interview: 

• The topic of the essay must be closely related to the master’s program theme. Starting from the theme of the climate crisis, you can choose any topic based on your interests (from awareness campaigns, communication of the climate crisis, the phenomenon of fake news, corporate responsibility, greenwashing, environmental injustice, European policy on climate crisis, brutal pollution events, green transition, etc. — sky is the limit, maybe a bit beyond, based on the subject of this program).
• The essay does not necessarily have to be theoretical; it can also be a case study. If you are not familiar with academic writing in social sciences, you can use bibliographies from any scientific field (it is a transdisciplinary master’s degree). However, you must have an academic bibliography (i.e., use previous research relevant to your topic). For this, we recommend using Google Scholar, a search engine specifically dedicated to academic papers.
•  The essay sould be between  3.200 – 4.000 words (including bibliography). As a structure, the essay should have an introduction (stating the issue raised by your essay or a research objective for a future research that you would like to do during the master and why you find that topic important or a brief presentation of the study case that your are to present), review of academic literature relevant for the issue/research objective, a conclusion section stating how the issue/topic/research objective raised in introduction is being dealt in the academic literature mentioned in literature review or why the study case presented is important, and a final bibliography section. Please, see our guide for academic writing available here. 
• We believe that the best admission essay is one in which you document the things that interest or fascinate you. So we advise you to choose a topic that you are curious to document. If your bachelor’s thesis was on a topic relevant to this master’s program, you can use elements from it, but we advise you to mention this in the introduction.
• The interview will focus on the reasons why you chose this master’s program, as well as on the presentation of your admission essay. In your presentation, you should be able to freely present the topic of your paper, explain why you found the topic interesting, and identify the most interesting elements you discovered during your research.