We tested whether the acquisition of knowledge and beliefs in a climate crisis class related to verified collective action. We studied undergraduate participants (N = 132) in the class (intervention condition) and participants not enrolled in the class (control condition). All participants answered questions about their knowledge and beliefs about the climate crisis, as well as their biospheric values, beliefs about efficacy, and climate anxiety, at two time points separated by nine weeks. We measured collective action in the intervention condition. First, we found that a few measures of knowledge and belief as well as biospheric values and belief in collective efficacy increased significantly in the intervention group relative to the control group. Second, within the intervention group, there were no significant relationships between the changes in several types of knowledge and beliefs and verified collective action. The only significant correlate was biospheric values measured prior to intervention exposure. These results point to the need for research to explore how variables other than knowledge and beliefs, such as group dynamics, relate to collective action. Finally, the study develops new methods for measuring people’s engagement in collective action in a class setting that goes beyond typical studies of intentions to act.