Research has shown a great distrust among youths toward political representatives, who they demand should “listen to the science.” However, less research has been done on youths’ own trust in science. This study explores and explains how youths who are environmentally active in two different environmental youth organizations relate to science in social media, whether they trust science, and how youths’ relation to science creates a discursive context in which they may develop their identity. The study uses the approach of discourse analysis to examine social media content published on Facebook by Fridays for Future Sweden and Fältbiologerna (the Swedish Field Biologists). The study shows (i) how subject positions for scientists and youth are created in relation to one another based on different expressions of youths’ trust in science and(ii) how environmental youth organizations, by identifying with science, make youths important actors in the discourse on climate change.