When drumming up support for a movement, remind people of their moral identity - that is, the extent to which they feel that moral traits (such as being fair, caring, and kind) are important to who they are as a person. This survey study finds that the strength of an individual's moral identity is significantly associated with their support for an emerging youth climate movement, Fridays4Future. However, given that this study uses a convenience sample of German adults and focuses on a highly polarizing social movement in Europe, caution should be taken when generalizing this result to the U.S.