The dramatic impacts of climate change have pushed thousands of young activists to shout out their indignation. These mobilizations have become the symbol of our 'tipping era': a clash of worlds between attachments to modernity and attempts to become 'terrestrial' (Latour, 2018) to stay within ecological boundaries. In this field, there has been an increasing body of theoretical work but empirical research is still in its infancy, providing little evidence of this ongoing struggle and what we can learn from the young activists' indignation. This article responds to this gap by exploring the case of Youth for Climate (YfC), the Belgian branch of the Fridays for Future movement. In particular, I show how their indignation, expressed in a narrative form, is pivotal to understand the competition between the modern and the terrestrial imaginary within the movement. Based on survey data, participant observations and focus groups, I conduct a two-level analysis. First, I find that the YfC indignation produces three interrelated stories: of unworthy politics, economic abuse and human survival. Second, I reveal how the affectivity of these stories articulates the competition between the modern and the terrestrial imaginary: from hope in the existing political institutions which anchors them in the modern imaginary, to compassion and fear which open a more terrestrial imaginary of collapse. Together, rather than mere competition, these stories reveal an ongoing oscillation and intersection between the modern and the terrestrial.